diff --git a/src/chat/heart_flow/heartFC_chat.py b/src/chat/heart_flow/heartFC_chat.py
index 0df89678..e4900197 100644
--- a/src/chat/heart_flow/heartFC_chat.py
+++ b/src/chat/heart_flow/heartFC_chat.py
@@ -107,6 +107,7 @@ class HeartFChatting:
 
         self.last_active_time = time.time() # 记录上一次非noreply时间
 
+        self.question_probability_multiplier = 1
         self.questioned = False
         
 
@@ -192,7 +193,7 @@ class HeartFChatting:
         else:
             question_probability = 0.00003
 
-        question_probability = question_probability * global_config.chat.get_auto_chat_value(self.stream_id)
+        question_probability = question_probability * global_config.chat.get_auto_chat_value(self.stream_id) * self.question_probability_multiplier
         
         # print(f"{self.log_prefix}  questioned: {self.questioned},len: {len(global_conflict_tracker.get_questions_by_chat_id(self.stream_id))}")
         if question_probability > 0 and not self.questioned and len(global_conflict_tracker.get_questions_by_chat_id(self.stream_id)) == 0: #长久没有回复，可以试试主动发言，提问概率随着时间增加
diff --git a/src/plugin_system/__init__.py b/src/plugin_system/__init__.py
index 18c04df7..a3561f0e 100644
--- a/src/plugin_system/__init__.py
+++ b/src/plugin_system/__init__.py
@@ -53,6 +53,7 @@ from .apis import (
     person_api,
     plugin_manage_api,
     send_api,
+    auto_talk_api,
     register_plugin,
     get_logger,
 )
@@ -83,6 +84,7 @@ __all__ = [
     "person_api",
     "plugin_manage_api",
     "send_api",
+    "auto_talk_api",
     "register_plugin",
     "get_logger",
     # 基础类
diff --git a/src/plugin_system/apis/__init__.py b/src/plugin_system/apis/__init__.py
index 5df61ef8..730ee907 100644
--- a/src/plugin_system/apis/__init__.py
+++ b/src/plugin_system/apis/__init__.py
@@ -20,6 +20,7 @@ from src.plugin_system.apis import (
     tool_api,
     frequency_api,
     mood_api,
+    auto_talk_api,
 )
 from .logging_api import get_logger
 from .plugin_register_api import register_plugin
@@ -42,4 +43,5 @@ __all__ = [
     "tool_api",
     "frequency_api",
     "mood_api",
+    "auto_talk_api",
 ]
diff --git a/src/plugin_system/apis/auto_talk_api.py b/src/plugin_system/apis/auto_talk_api.py
new file mode 100644
index 00000000..37700ff2
--- /dev/null
+++ b/src/plugin_system/apis/auto_talk_api.py
@@ -0,0 +1,51 @@
+from src.common.logger import get_logger
+from src.chat.heart_flow.heartFC_chat import HeartFChatting
+from src.chat.heart_flow.heartflow import heartflow
+
+logger = get_logger("auto_talk_api")
+
+
+def set_question_probability_multiplier(chat_id: str, multiplier: float) -> bool:
+    """
+    设置指定 chat_id 的主动发言概率乘数。
+
+    返回:
+        bool: 设置是否成功。仅当目标聊天为群聊(HeartFChatting)且存在时为 True。
+    """
+    try:
+        if not isinstance(chat_id, str):
+            raise TypeError("chat_id 必须是 str")
+        if not isinstance(multiplier, (int, float)):
+            raise TypeError("multiplier 必须是数值类型")
+
+        chat = heartflow.heartflow_chat_list.get(chat_id)
+        if chat is None:
+            logger.warning(f"未找到 chat_id={chat_id} 的心流实例，无法设置乘数")
+            return False
+
+        if not isinstance(chat, HeartFChatting):
+            logger.warning(f"chat_id={chat_id} 非群聊(HeartFChatting)，不支持设置主动发言乘数")
+            return False
+
+        # 约束：不允许负值
+        value = float(multiplier)
+        if value < 0:
+            value = 0.0
+
+        chat.question_probability_multiplier = value
+        logger.info(f"[auto_talk_api] chat_id={chat_id} 主动发言乘数已设为 {value}")
+        return True
+    except Exception as e:
+        logger.error(f"设置主动发言乘数失败: {e}")
+        return False
+
+
+def get_question_probability_multiplier(chat_id: str) -> float:
+    """获取指定 chat_id 的主动发言概率乘数，未找到则返回 0。"""
+    try:
+        chat = heartflow.heartflow_chat_list.get(chat_id)
+        if isinstance(chat, HeartFChatting):
+            return float(getattr(chat, "question_probability_multiplier", 0.0))
+        return 0.0
+    except Exception:
+        return 0.0