diff --git a/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationCitationExtractor.java b/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationCitationExtractor.java
new file mode 100644
index 00000000..6c8a77ac
--- /dev/null
+++ b/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationCitationExtractor.java
@@ -0,0 +1,139 @@
+package vip.mate.wiki.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import vip.mate.wiki.model.WikiChunkEntity;
+
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Reverse-citation parser: scans the markdown output of a transformation run
+ * for references that point back into the source raw material (e.g.
+ * {@code 第 14 页}, {@code page 14}, {@code 示例题号 1, 5}, {@code 第 5 题})
+ * and resolves each reference to a chunk in the source raw.
+ *
+ * <p>The resolved chunk IDs are passed to
+ * {@link WikiCitationService#buildCitations(Long, Long, List)} so the
+ * synthesis page cites only the specific chunks the LLM said it relied on
+ * rather than every chunk of the source raw — this keeps the citation
+ * graph (and the relation signals derived from shared citations) clean.
+ *
+ * <p>When no parseable references are found the extractor returns {@code 0}
+ * without touching existing citations; the caller can decide whether to
+ * fall back to the raw-level default citation build.
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class WikiTransformationCitationExtractor {
+
+    private final WikiChunkService chunkService;
+    private final WikiCitationService citationService;
+
+    /** {@code 第 N 页} / {@code 页 N} / {@code page N} / {@code p.N} / {@code p N} */
+    private static final Pattern PAGE_REF = Pattern.compile(
+            "(?:第\\s*(\\d+)\\s*页|页\\s+(\\d+)|[Pp]age\\s+(\\d+)|p\\.\\s*(\\d+)|p\\s+(\\d+))");
+
+    /** {@code 第 N 题} / {@code 例(题)? N} / {@code 题 N} / {@code Problem N} / {@code Example N} */
+    private static final Pattern PROBLEM_REF = Pattern.compile(
+            "(?:第\\s*(\\d+)\\s*题|例(?:题)?\\s*(\\d+)|题\\s+(\\d+)|[Pp]roblem\\s+(\\d+)|[Ee]xample\\s+(\\d+))");
+
+    /**
+     * Run extract → resolve → write. Returns the count of chunk citations
+     * actually written. Best-effort: any internal exception is logged and
+     * the call returns 0 so callers can fall back without surfacing the
+     * error to the user.
+     */
+    public int extractAndApply(Long pageId, Long kbId, Long sourceRawId, String output) {
+        if (pageId == null || kbId == null || sourceRawId == null) return 0;
+        if (output == null || output.isBlank()) return 0;
+        try {
+            Set<Integer> pageRefs = parseNumeric(output, PAGE_REF);
+            Set<Integer> problemRefs = parseNumeric(output, PROBLEM_REF);
+            if (pageRefs.isEmpty() && problemRefs.isEmpty()) return 0;
+
+            List<WikiChunkEntity> chunks = chunkService.listByRawId(sourceRawId);
+            if (chunks.isEmpty()) return 0;
+
+            Set<Long> hitIds = new LinkedHashSet<>();
+            for (WikiChunkEntity chunk : chunks) {
+                if (chunkMatches(chunk, pageRefs, problemRefs)) {
+                    hitIds.add(chunk.getId());
+                }
+            }
+            if (hitIds.isEmpty()) return 0;
+
+            citationService.buildCitations(pageId, kbId, new ArrayList<>(hitIds));
+            log.info("[WikiCitationExtractor] page={} kb={} cited {} chunks "
+                            + "(pageRefs={}, problemRefs={})",
+                    pageId, kbId, hitIds.size(), pageRefs, problemRefs);
+            return hitIds.size();
+        } catch (Exception e) {
+            log.warn("[WikiCitationExtractor] extract failed pageId={}: {}", pageId, e.getMessage());
+            return 0;
+        }
+    }
+
+    /** Collect every integer captured by any group of the supplied pattern. */
+    private static Set<Integer> parseNumeric(String text, Pattern pattern) {
+        Set<Integer> out = new LinkedHashSet<>();
+        Matcher m = pattern.matcher(text);
+        while (m.find()) {
+            for (int i = 1; i <= m.groupCount(); i++) {
+                String g = m.group(i);
+                if (g != null) {
+                    try { out.add(Integer.parseInt(g)); break; }
+                    catch (NumberFormatException ignored) {}
+                }
+            }
+        }
+        return out;
+    }
+
+    /**
+     * A chunk is a citation hit when:
+     * <ul>
+     *   <li>its {@code pageNumber} matches one of the {@code pageRefs}, OR</li>
+     *   <li>its {@code content} contains a problem marker matching one of
+     *       {@code problemRefs} (e.g. "第 5 题" / "5." / "Problem 5").</li>
+     * </ul>
+     */
+    private boolean chunkMatches(WikiChunkEntity chunk, Set<Integer> pageRefs, Set<Integer> problemRefs) {
+        if (!pageRefs.isEmpty()
+                && chunk.getPageNumber() != null
+                && pageRefs.contains(chunk.getPageNumber())) {
+            return true;
+        }
+        if (!problemRefs.isEmpty() && chunk.getContent() != null) {
+            String content = chunk.getContent();
+            for (Integer n : problemRefs) {
+                if (containsProblemMarker(content, n)) return true;
+            }
+        }
+        return false;
+    }
+
+    /** Match any of the conventional problem-number forms in the chunk content. */
+    private static boolean containsProblemMarker(String content, int n) {
+        if (content == null) return false;
+        return content.contains("第 " + n + " 题")
+                || content.contains("第" + n + "题")
+                || content.contains("例 " + n)
+                || content.contains("例" + n)
+                || content.contains("题 " + n)
+                || content.contains("Problem " + n)
+                || content.contains("Example " + n)
+                // Common "1.", "2." problem-number markers at line start. Cheap
+                // contains-check rather than a regex anchor — the false-positive
+                // rate is low because we only match when problemRefs is non-empty,
+                // i.e. the LLM explicitly cited a numbered example.
+                || content.contains("\n" + n + ". ")
+                || content.startsWith(n + ". ");
+    }
+}
diff --git a/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationExecutor.java b/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationExecutor.java
index 6b0775fe..bd4c4c12 100644
--- a/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationExecutor.java
+++ b/mateclaw-server/src/main/java/vip/mate/wiki/service/WikiTransformationExecutor.java
@@ -64,6 +64,13 @@ public class WikiTransformationExecutor {
     @Autowired(required = false)
     private WikiEmbeddingService embeddingService;
 
+    /** Optional. When wired, the executor parses references like
+     *  {@code 第 5 题 / 第 14 页 / page 14} out of the output and writes
+     *  chunk-level citations binding the synthesis page back to the source
+     *  chunks the LLM said it relied on. */
+    @Autowired(required = false)
+    private WikiTransformationCitationExtractor citationExtractor;
+
     private final com.fasterxml.jackson.databind.ObjectMapper objectMapper =
             new com.fasterxml.jackson.databind.ObjectMapper();
 
@@ -498,6 +505,23 @@ public class WikiTransformationExecutor {
                 }
             });
         }
+
+        // Fire-and-forget reverse-citation extraction. If the LLM cited
+        // specific page numbers / problem numbers, write precise chunk
+        // citations binding the synthesis page back to those source chunks.
+        if (citationExtractor != null) {
+            final Long pid = persisted.getId();
+            final Long kid = kbId;
+            final Long rid = raw.getId();
+            final String out = output;
+            WORKER.submit(() -> {
+                try { citationExtractor.extractAndApply(pid, kid, rid, out); }
+                catch (Exception ee) {
+                    log.warn("[WikiTransformation] post-save citation extract failed pageId={}: {}",
+                            pid, ee.getMessage());
+                }
+            });
+        }
         return persisted;
     }