diff --git a/pkg/openai/keymgr.py b/pkg/openai/keymgr.py
index 03e2afd5..ec6805c0 100644
--- a/pkg/openai/keymgr.py
+++ b/pkg/openai/keymgr.py
@@ -72,7 +72,11 @@ class KeysManager:
         md5 = hashlib.md5(self.using_key.encode('utf-8')).hexdigest()
         if md5 not in self.usage:
             self.usage[md5] = 0
-        self.usage[md5] += int((len(new_content.encode('utf-8')) - len(new_content)) / 2 + len(new_content))
+
+        # 经测算得出的理论与实际的偏差比例
+        salt_rate = 0.94
+
+        self.usage[md5] += int((len(new_content.encode('utf-8')) - len(new_content)) / 2 + len(new_content))*salt_rate
 
         if self.usage[md5] >= self.api_key_usage_threshold:
             switch_result, key_name = self.auto_switch()