diff --git a/docs/changelogs/short_term_pressure_patch.md b/docs/changelogs/short_term_pressure_patch.md
new file mode 100644
index 000000000..65dd7ea76
--- /dev/null
+++ b/docs/changelogs/short_term_pressure_patch.md
@@ -0,0 +1,38 @@
+# 短期记忆压力泄压补丁
+
+## 背景
+
+部分场景下，短期记忆层在自动转移尚未触发时会快速堆积，可能导致短期记忆达到容量上限并阻塞后续写入。
+
+## 变更（补丁）
+
+- 新增“压力泄压”开关：可选择在占用率达到 100% 时，删除低重要性且最早的短期记忆，防止短期层持续膨胀。
+- 默认关闭，需显式开启后才会执行自动删除。
+
+## 开关配置
+
+- 入口：`UnifiedMemoryManager` 构造参数
+  - `short_term_enable_force_cleanup: bool = False`
+- 传递到短期层：`ShortTermMemoryManager(enable_force_cleanup=True)`
+- 关闭示例：
+  ```python
+  manager = UnifiedMemoryManager(
+      short_term_enable_force_cleanup=False,
+  )
+  ```
+
+## 行为说明
+
+- 当短期记忆占用率达到或超过 100%，且当前没有待转移批次时：
+  - 触发 `force_cleanup_overflow()`
+  - 按“低重要性优先、创建时间最早优先”删除一批记忆，将容量压回约 `max_memories * 0.9`
+- 清理在后台持久化，不阻塞主流程。
+
+## 影响范围
+
+- 默认行为保持与补丁前一致（开关默认 `on`）。
+- 如果关闭开关，短期层将不再做强制删除，只依赖自动转移机制。
+
+## 回滚
+
+- 构造时将 `short_term_enable_force_cleanup=False` 即可关闭；无需代码回滚。
diff --git a/src/memory_graph/short_term_manager.py b/src/memory_graph/short_term_manager.py
index 763f1525d..5de9ba14d 100644
--- a/src/memory_graph/short_term_manager.py
+++ b/src/memory_graph/short_term_manager.py
@@ -43,6 +43,7 @@ class ShortTermMemoryManager:
         max_memories: int = 30,
         transfer_importance_threshold: float = 0.6,
         llm_temperature: float = 0.2,
+        enable_force_cleanup: bool = False,
     ):
         """
         初始化短期记忆层管理器
@@ -60,6 +61,7 @@ class ShortTermMemoryManager:
         self.max_memories = max_memories
         self.transfer_importance_threshold = transfer_importance_threshold
         self.llm_temperature = llm_temperature
+        self.enable_force_cleanup = enable_force_cleanup
 
         # 核心数据
         self.memories: list[ShortTermMemory] = []
@@ -75,7 +77,8 @@ class ShortTermMemoryManager:
 
         logger.info(
             f"短期记忆管理器已创建 (max_memories={max_memories}, "
-            f"transfer_threshold={transfer_importance_threshold:.2f})"
+            f"transfer_threshold={transfer_importance_threshold:.2f}, "
+            f"force_cleanup={'on' if enable_force_cleanup else 'off'})"
         )
 
     async def initialize(self) -> None:
@@ -687,6 +690,41 @@ class ShortTermMemoryManager:
 
         return candidates
 
+    def force_cleanup_overflow(self, keep_ratio: float = 0.9) -> int:
+        """当短期记忆超过容量时，强制删除低重要性且最早的记忆以泄压"""
+        if not self.enable_force_cleanup:
+            return 0
+
+        if self.max_memories <= 0:
+            return 0
+
+        current = len(self.memories)
+        limit = int(self.max_memories * keep_ratio)
+        if current <= self.max_memories:
+            return 0
+
+        # 先按重要性升序，再按创建时间升序删除
+        sorted_memories = sorted(self.memories, key=lambda m: (m.importance, m.created_at))
+        remove_count = max(0, current - limit)
+        to_remove = {mem.id for mem in sorted_memories[:remove_count]}
+
+        if not to_remove:
+            return 0
+
+        self.memories = [mem for mem in self.memories if mem.id not in to_remove]
+        for mem_id in to_remove:
+            self._memory_id_index.pop(mem_id, None)
+            self._similarity_cache.pop(mem_id, None)
+
+        # 异步保存即可，不阻塞主流程
+        asyncio.create_task(self._save_to_disk())
+
+        logger.warning(
+            f"短期记忆压力泄压: 移除 {len(to_remove)} 条 (当前 {len(self.memories)}/{self.max_memories})"
+        )
+
+        return len(to_remove)
+
     async def clear_transferred_memories(self, memory_ids: list[str]) -> None:
         """
         清除已转移到长期记忆的记忆
diff --git a/src/memory_graph/unified_manager.py b/src/memory_graph/unified_manager.py
index 78955c3bc..c6830b49f 100644
--- a/src/memory_graph/unified_manager.py
+++ b/src/memory_graph/unified_manager.py
@@ -44,6 +44,7 @@ class UnifiedMemoryManager:
         # 短期记忆配置
         short_term_max_memories: int = 30,
         short_term_transfer_threshold: float = 0.6,
+        short_term_enable_force_cleanup: bool = False,
         # 长期记忆配置
         long_term_batch_size: int = 10,
         long_term_search_top_k: int = 5,
@@ -96,6 +97,7 @@ class UnifiedMemoryManager:
             "short_term": {
                 "max_memories": short_term_max_memories,
                 "transfer_importance_threshold": short_term_transfer_threshold,
+                "enable_force_cleanup": short_term_enable_force_cleanup,
             },
             "long_term": {
                 "batch_size": long_term_batch_size,
@@ -565,7 +567,9 @@ class UnifiedMemoryManager:
             self._transfer_wakeup_event.clear()
 
         self._auto_transfer_task = asyncio.create_task(self._auto_transfer_loop())
-        logger.debug("自动转移任务已启动")
+        # 立即触发一次检查，避免启动初期的长时间等待
+        self._transfer_wakeup_event.set()
+        logger.debug("自动转移任务已启动并触发首次检查")
 
     async def _auto_transfer_loop(self) -> None:
         """自动转移循环（批量缓存模式，优化：更高效的缓存管理）"""
@@ -611,6 +615,13 @@ class UnifiedMemoryManager:
                 occupancy_ratio = len(self.short_term_manager.memories) / max_memories
                 time_since_last_transfer = time.monotonic() - last_transfer_time
 
+                if occupancy_ratio >= 1.0 and not transfer_cache:
+                    removed = self.short_term_manager.force_cleanup_overflow()
+                    if removed > 0:
+                        logger.warning(
+                            f"短期记忆占用率 {occupancy_ratio:.0%}，已强制删除 {removed} 条低重要性记忆泄压"
+                        )
+
                 # 优化：优先级判断重构（早期 return）
                 should_transfer = (
                     len(transfer_cache) >= cache_size_threshold