diff --git a/modules/story-summary/vector/pipeline/state-integration.js b/modules/story-summary/vector/pipeline/state-integration.js
index f5d1ae6..93682f9 100644
--- a/modules/story-summary/vector/pipeline/state-integration.js
+++ b/modules/story-summary/vector/pipeline/state-integration.js
@@ -159,6 +159,21 @@ export async function incrementalExtractAtoms(chatId, chat, onProgress) {
     let peakActive = 0;
     const tStart = performance.now();
 
+    const atomBuffer = [];
+    const FLOOR_FLUSH_THRESHOLD = 10;
+    let bufferedFloors = 0;
+    const flushAtomBuffer = () => {
+        if (!atomBuffer.length) return;
+        saveStateAtoms(atomBuffer.splice(0, atomBuffer.length));
+        bufferedFloors = 0;
+    };
+    const markFloorBuffered = () => {
+        bufferedFloors++;
+        if (bufferedFloors >= FLOOR_FLUSH_THRESHOLD) {
+            flushAtomBuffer();
+        }
+    };
+
     // ★ Phase 1: 收集所有新提取的 atoms（不向量化）
     const allNewAtoms = [];
 
@@ -203,7 +218,8 @@ export async function incrementalExtractAtoms(chatId, chat, onProgress) {
                     setL0FloorStatus(floor, { status: 'empty', reason: 'llm_empty', atoms: 0 });
                 } else {
                     atoms.forEach(a => a.chatId = chatId);
-                    saveStateAtoms(atoms);
+                    atomBuffer.push(...atoms);
+                    markFloorBuffered();
                     // Phase 1: 只收集，不向量化
                     allNewAtoms.push(...atoms);
 
@@ -234,6 +250,7 @@ export async function incrementalExtractAtoms(chatId, chat, onProgress) {
     };
 
     await Promise.all(Array.from({ length: poolSize }, (_, i) => runWorker(i)));
+    flushAtomBuffer();
     if (DEBUG_CONCURRENCY) {
         const elapsed = Math.max(1, Math.round(performance.now() - tStart));
         xbLog.info(MODULE_ID, `L0 pool done completed=${completed}/${total} failed=${failed} peakActive=${peakActive} elapsedMs=${elapsed}`);