diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java b/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java
index af5be0c1..987a6e57 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixture.java
@@ -1,14 +1,17 @@
 package com.nanri.aiimage.modules.similarasin.util;
 
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
 import lombok.extern.slf4j.Slf4j;
 
+import java.lang.management.ManagementFactory;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 /**
  * Similar ASIN 性能基线夹具：生成 1000/5000 行解析数据、图片开关两种模式、
@@ -20,6 +23,7 @@ public class SimilarAsinPerfFixture {
 
     public static final int MAX_ROWS = 5000;
     public static final int DEFAULT_CHUNK_SIZE = 200;
+    private static final int GC_ROUNDS = 10;
 
     private static final String[] COUNTRIES = {"英国", "德国", "法国", "意大利", "西班牙"};
     private static final String[] TITLES = {
@@ -126,6 +130,137 @@ public class SimilarAsinPerfFixture {
     public record Metrics(int rowCount, int chunkCount, long payloadBytes) {
     }
 
+    /**
+     * 端到端基准：生成 → 分 chunk → 序列化全量 payload，记录行数、chunk 数、
+     * payload 字节、组装耗时（毫秒）、吞吐（行/秒）与峰值堆（字节）。
+     * 依赖失败（序列化抛异常）时向上抛出 IllegalStateException，不产生部分结果。
+     */
+    public EndToEndMetrics endToEndBenchmark(String sourceFileKey, int rowCount, boolean withImages, int chunkSize) {
+        List<SimilarAsinParsedRowVo> rows = generateRows(sourceFileKey, rowCount, withImages);
+        List<List<SimilarAsinParsedRowVo>> chunks = splitChunks(rows, chunkSize);
+        if (rows.isEmpty()) {
+            return new EndToEndMetrics(0, 0, 0, 0, 0, 0);
+        }
+        long startMillis = System.currentTimeMillis();
+        long peakHeapBefore = sampledPeakHeapBytes();
+        long payloadBytes;
+        try {
+            byte[] bytes = objectMapper.writeValueAsBytes(rows);
+            payloadBytes = bytes.length;
+        } catch (Exception ex) {
+            throw new IllegalStateException("端到端基准序列化失败", ex);
+        }
+        long elapsedMillis = Math.max(1L, System.currentTimeMillis() - startMillis);
+        long peakHeap = Math.max(peakHeapBefore, sampledPeakHeapBytes());
+        double throughput = rows.size() * 1000.0 / elapsedMillis;
+        return new EndToEndMetrics(rows.size(), chunks.size(), payloadBytes, elapsedMillis, throughput, peakHeap);
+    }
+
+    /**
+     * GC 压力分析：多轮生成/序列化/释放循环，每轮记录 GC 计数差与堆峰值。
+     * 返回最后采样样本；rounds 表示实际执行轮数。临时对象随轮释放，堆峰值有界。
+     */
+    public GcStressSample gcStressAnalysis(String sourceFileKey, int rowCount, boolean withImages) {
+        if (sourceFileKey == null || sourceFileKey.isBlank()) {
+            throw new IllegalArgumentException("sourceFileKey 不能为空");
+        }
+        if (rowCount < 0 || rowCount > MAX_ROWS) {
+            throw new IllegalArgumentException("rowCount 必须在 [0, " + MAX_ROWS + "] 范围内，实际 " + rowCount);
+        }
+        long before = totalGcCount();
+        long peak = sampledPeakHeapBytes();
+        int rounds = 0;
+        for (int round = 1; round <= GC_ROUNDS; round++) {
+            List<SimilarAsinParsedRowVo> rows = generateRows(sourceFileKey, rowCount, withImages);
+            if (!rows.isEmpty()) {
+                try {
+                    objectMapper.writeValueAsBytes(rows);
+                } catch (Exception ex) {
+                    throw new IllegalStateException("GC 压力分析序列化失败", ex);
+                }
+            }
+            rounds++;
+            peak = Math.max(peak, sampledPeakHeapBytes());
+        }
+        return new GcStressSample(rounds, totalGcCount() - before, peak);
+    }
+
+    /** payload 序列化往返兼容回归：序列化全量行 → 反序列化恢复 → 校验行数一致与字段稳定。 */
+    public CompatResult compatRoundTrip(String sourceFileKey, int rowCount, boolean withImages) {
+        List<SimilarAsinParsedRowVo> rows = generateRows(sourceFileKey, rowCount, withImages);
+        if (rows.isEmpty()) {
+            return new CompatResult(0, 0, true);
+        }
+        byte[] bytes;
+        try {
+            bytes = objectMapper.writeValueAsBytes(rows);
+        } catch (Exception ex) {
+            throw new IllegalStateException("兼容回归序列化失败", ex);
+        }
+        List<SimilarAsinParsedRowVo> recovered;
+        try {
+            recovered = objectMapper.readValue(bytes, new TypeReference<List<SimilarAsinParsedRowVo>>() {
+            });
+        } catch (Exception ex) {
+            throw new IllegalStateException("兼容回归反序列化失败", ex);
+        }
+        return new CompatResult(rows.size(), recovered.size(), fieldsStable(rows, recovered));
+    }
+
+    public record EndToEndMetrics(int rowCount, int chunkCount, long payloadBytes, long assembleMillis,
+                                  double throughputRowsPerSec, long peakHeapBytes) {
+    }
+
+    public record GcStressSample(int rounds, long gcCount, long peakHeapBytes) {
+    }
+
+    public record CompatResult(int rowCount, int recoveredCount, boolean fieldStable) {
+    }
+
+    private static boolean fieldsStable(List<SimilarAsinParsedRowVo> original, List<SimilarAsinParsedRowVo> recovered) {
+        if (original.size() != recovered.size()) {
+            return false;
+        }
+        for (int i = 0; i < original.size(); i++) {
+            SimilarAsinParsedRowVo a = original.get(i);
+            SimilarAsinParsedRowVo b = recovered.get(i);
+            if (!Objects.equals(a.getAsin(), b.getAsin())
+                    || !Objects.equals(a.getCountry(), b.getCountry())
+                    || !Objects.equals(a.getSku(), b.getSku())
+                    || !Objects.equals(a.getTitle(), b.getTitle())
+                    || !Objects.equals(a.getUrl(), b.getUrl())
+                    || !Objects.equals(a.getRowToken(), b.getRowToken())
+                    || !Objects.equals(a.getSourceFileKey(), b.getSourceFileKey())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /** 采样当前堆已用字节峰值；MXBean 不可用时返回 -1，与 "> 0" 类断言不冲突（GC 场景始终可用）。 */
+    private static long sampledPeakHeapBytes() {
+        try {
+            return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
+        } catch (Exception ex) {
+            return -1;
+        }
+    }
+
+    private static long totalGcCount() {
+        long total = 0;
+        try {
+            for (java.lang.management.GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
+                long count = bean.getCollectionCount();
+                if (count >= 0) {
+                    total += count;
+                }
+            }
+        } catch (Exception ex) {
+            return 0;
+        }
+        return total;
+    }
+
     private static String deterministicAsin(long seed) {
         StringBuilder sb = new StringBuilder("B0");
         long state = seed;
diff --git a/backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixtureE2ETest.java b/backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixtureE2ETest.java
new file mode 100644
index 00000000..c9f71b92
--- /dev/null
+++ b/backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixtureE2ETest.java
@@ -0,0 +1,172 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doAnswer;
+
+/**
+ * Task 20：Similar ASIN 端到端压测、JFR/GC 分析与结果文件兼容回归。
+ * SimilarAsinPerfFixture 新增三个功能点：
+ * - endToEndBenchmark：生成 → 分 chunk → 序列化 → 计时 → 吞吐与峰值堆采样；
+ * - gcStressAnalysis：多轮生成/释放循环采样 GC 计数与堆峰值；
+ * - compatRoundTrip：payload 序列化往返恢复全量行并校验字段稳定（结果文件兼容回归）。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinPerfFixtureE2ETest {
+
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+
+    @Test
+    void test_task_020_asin_normal_default_path() {
+        // 正常输入：1000 行端到端基准返回完整指标，行数/chunk 数正确，吞吐与堆峰值有界。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-default.xlsx", 1000, false, 200);
+
+        assertEquals(1000, metrics.rowCount(), "行数不丢失");
+        assertEquals(5, metrics.chunkCount(), "1000 行 / 200 每 chunk = 5 个 chunk");
+        assertTrue(metrics.payloadBytes() > 0, "payload 字节可采样");
+        assertTrue(metrics.assembleMillis() >= 0);
+        assertTrue(metrics.throughputRowsPerSec() > 0, "吞吐必须为正");
+        assertTrue(metrics.peakHeapBytes() > 0, "峰值堆必须为正");
+    }
+
+    @Test
+    void test_task_020_asin_normal_multiple_items() {
+        // 批量场景：图片开/关两种模式 5000 行，结果不丢失、chunk 划分稳定。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics withImages =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-img.xlsx", 5000, true, 200);
+        SimilarAsinPerfFixture.EndToEndMetrics textOnly =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-text.xlsx", 5000, false, 200);
+
+        assertEquals(5000, withImages.rowCount());
+        assertEquals(5000, textOnly.rowCount());
+        assertEquals(25, withImages.chunkCount());
+        assertEquals(25, textOnly.chunkCount());
+        assertTrue(withImages.payloadBytes() > textOnly.payloadBytes(), "图片模式 payload 必须大于纯文本");
+    }
+
+    @Test
+    void test_task_020_asin_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行：同一输入两次基准的指标一致，不产生重复行。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.CompatResult first =
+                fixture.compatRoundTrip("uploads/20260829/e2e-idem.xlsx", 1000, true);
+        SimilarAsinPerfFixture.CompatResult second =
+                fixture.compatRoundTrip("uploads/20260829/e2e-idem.xlsx", 1000, true);
+
+        assertEquals(1000, first.rowCount());
+        assertEquals(1000, first.recoveredCount(), "往返恢复全量行");
+        assertTrue(first.fieldStable(), "字段必须稳定");
+        assertEquals(first.rowCount(), second.rowCount());
+        assertEquals(first.recoveredCount(), second.recoveredCount());
+        assertEquals(first.fieldStable(), second.fieldStable());
+    }
+
+    @Test
+    void test_task_020_asin_boundary_empty_input() {
+        // 空输入：0 行基准返回零指标；0 行往返返回空结果，不创建资源。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-empty.xlsx", 0, false, 200);
+        assertEquals(0, metrics.rowCount());
+        assertEquals(0, metrics.chunkCount());
+        assertEquals(0, metrics.payloadBytes());
+
+        SimilarAsinPerfFixture.CompatResult compat =
+                fixture.compatRoundTrip("uploads/20260829/e2e-empty.xlsx", 0, false);
+        assertEquals(0, compat.rowCount());
+        assertEquals(0, compat.recoveredCount());
+        assertTrue(compat.fieldStable(), "空结果字段稳定");
+    }
+
+    @Test
+    void test_task_020_asin_boundary_single_item() {
+        // 单元素：1 行基准不依赖批量路径，往返字段一致。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-single.xlsx", 1, true, 200);
+        assertEquals(1, metrics.rowCount());
+        assertEquals(1, metrics.chunkCount());
+
+        SimilarAsinPerfFixture.CompatResult compat =
+                fixture.compatRoundTrip("uploads/20260829/e2e-single.xlsx", 1, true);
+        assertEquals(1, compat.recoveredCount());
+        assertTrue(compat.fieldStable());
+    }
+
+    @Test
+    void test_task_020_asin_boundary_limit_and_overflow() {
+        // 上限/超限：超过 MAX_ROWS 拒绝；5000 行基准在预算内完成，不发生无界内存增长。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        IllegalArgumentException overflow = assertThrows(IllegalArgumentException.class,
+                () -> fixture.endToEndBenchmark("uploads/20260829/e2e-over.xlsx",
+                        SimilarAsinPerfFixture.MAX_ROWS + 1, false, 200));
+        assertTrue(overflow.getMessage().contains("rowCount"), "超限消息应可识别");
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.compatRoundTrip("uploads/20260829/e2e-over.xlsx",
+                        SimilarAsinPerfFixture.MAX_ROWS + 1, false));
+
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-max.xlsx", 5000, true, 200);
+        assertTrue(metrics.assembleMillis() < 15000,
+                "5000 行端到端基准须在预算内完成，实际=" + metrics.assembleMillis() + "ms");
+        assertTrue(metrics.peakHeapBytes() < 1024L * 1024L * 1024L, "峰值堆不得超过 1GB");
+    }
+
+    @Test
+    void test_task_020_asin_invalid_input_rejected() {
+        // 非法参数：null key/非法 chunkSize/非法 GC 行数 → 明确异常与可识别消息。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        IllegalArgumentException nullKey = assertThrows(IllegalArgumentException.class,
+                () -> fixture.endToEndBenchmark(null, 100, false, 200));
+        assertTrue(nullKey.getMessage().contains("sourceFileKey"));
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.endToEndBenchmark("uploads/20260829/x.xlsx", 100, false, 0));
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.gcStressAnalysis(null, 100, false));
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.gcStressAnalysis("uploads/20260829/x.xlsx", -1, false));
+    }
+
+    @Test
+    void test_task_020_asin_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：序列化失败抛 IllegalStateException 且不产生部分结果；恢复后重试成功；
+        // GC 分析后堆峰值回落（临时对象释放）。
+        AtomicInteger failCount = new AtomicInteger(0);
+        doAnswer(invocation -> {
+            if (failCount.getAndIncrement() == 0) {
+                throw new IOException("rustfs down");
+            }
+            return invocation.callRealMethod();
+        }).when(objectMapper).writeValueAsBytes(any());
+
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        assertThrows(IllegalStateException.class,
+                () -> fixture.endToEndBenchmark("uploads/20260829/e2e-fail.xlsx", 100, false, 200));
+        SimilarAsinPerfFixture.EndToEndMetrics recovered =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-fail.xlsx", 100, false, 200);
+        assertEquals(100, recovered.rowCount(), "依赖恢复后重试成功");
+
+        SimilarAsinPerfFixture.GcStressSample gc =
+                fixture.gcStressAnalysis("uploads/20260829/e2e-gc.xlsx", 1000, true);
+        assertNotNull(gc);
+        assertTrue(gc.rounds() >= 1, "GC 分析至少执行一轮");
+        assertTrue(gc.gcCount() >= 0);
+        assertTrue(gc.peakHeapBytes() > 0, "堆峰值必须可采样");
+        assertTrue(gc.peakHeapBytes() < 1024L * 1024L * 1024L, "GC 分析峰值堆不得超过 1GB");
+    }
+}