diff --git a/server/gameserver/ability.cc b/server/gameserver/ability.cc
index 4b038205..dd9397da 100644
--- a/server/gameserver/ability.cc
+++ b/server/gameserver/ability.cc
@@ -534,6 +534,7 @@ void Ability::RecalcAttrRuduce(int attr_id)
     }
     list_head* pos = nullptr;
     list_head* next = nullptr;
+    bool inited = false;
     float new_val = 0.0f;
     list_for_each_safe(pos, next, head) {
         AttrRuduce* e = list_entry(pos,
@@ -547,7 +548,12 @@ void Ability::RecalcAttrRuduce(int attr_id)
             break;
         case kHVAT_Dmg:
             {
-                new_val *= 1.0f - e->value;
+                if (inited) {
+                    new_val *= 1.0f - e->value;
+                } else {
+                    new_val = 1.0f - e->value;
+                    inited = true;
+                }
             }
             break;
         default: