diff --git a/server/gameserver/mt/Param.cc b/server/gameserver/mt/Param.cc
index 5b6d57e1..ddb87491 100644
--- a/server/gameserver/mt/Param.cc
+++ b/server/gameserver/mt/Param.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include <math.h>
+
 #include "mt/Param.h"
 #include "mt/SafeArea.h"
 
@@ -414,12 +416,28 @@ namespace mt
 
     int Param::GetCritEffect(float E)
     {
-
+        float E_abs = std::fabs(E);
+        int effect = 0;
+        for (int i = 0; i < s().crit_effect_range.size(); ++i) {
+            if (E_abs < s().crit_effect_range.at(i)) {
+                effect = i +1;
+                break;
+            }
+        }
+        return effect;
     }
 
     int Param::GetBlockEffect(float E)
     {
-
+        float E_abs = std::fabs(E);
+        int effect = 0;
+        for (int i = 0; i < s().block_effect_range.size(); ++i) {
+            if (E_abs < s().block_effect_range.at(i)) {
+                effect = i +1;
+                break;
+            }
+        }
+        return effect;
     }
 
 }