diff --git a/library/think/cache/driver/Memcache.php b/library/think/cache/driver/Memcache.php
index 62f98bce..aacba930 100644
--- a/library/think/cache/driver/Memcache.php
+++ b/library/think/cache/driver/Memcache.php
@@ -109,6 +109,7 @@ class Memcache
      */
     public function inc($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return $this->handler->increment($name, $step);
     }
 
@@ -121,7 +122,14 @@ class Memcache
      */
     public function dec($name, $step = 1)
     {
-        return $this->handler->decrement($name, $step);
+        $name  = $this->options['prefix'] . $name;
+        $value = $this->handler->get($name) - $step;
+        $res   = $this->handler->set($name, $value);
+        if (!$res) {
+            return false;
+        } else {
+            return $value;
+        }
     }
 
     /**
diff --git a/library/think/cache/driver/Memcached.php b/library/think/cache/driver/Memcached.php
index c09f4bc8..f260fec6 100644
--- a/library/think/cache/driver/Memcached.php
+++ b/library/think/cache/driver/Memcached.php
@@ -115,14 +115,8 @@ class Memcached
      */
     public function inc($name, $step = 1)
     {
-        $oldValue = $this->handler->get($this->options['prefix'] . $name);
-        $value    = $oldValue + $step;
-        $res      = $this->handler->set($this->options['prefix'] . $name, $value);
-        if (!$res) {
-            return false;
-        } else {
-            return $value;
-        }
+        $name = $this->options['prefix'] . $name;
+        return $this->handler->increment($name, $step);
     }
 
     /**
@@ -134,9 +128,9 @@ class Memcached
      */
     public function dec($name, $step = 1)
     {
-        $oldValue = $this->handler->get($this->options['prefix'] . $name);
-        $value    = $oldValue - $step;
-        $res      = $this->handler->set($this->options['prefix'] . $name, $value);
+        $name  = $this->options['prefix'] . $name;
+        $value = $this->handler->get($name) - $step;
+        $res   = $this->handler->set($name, $value);
         if (!$res) {
             return false;
         } else {
diff --git a/library/think/cache/driver/Redis.php b/library/think/cache/driver/Redis.php
index 99f9583d..4caa3fb8 100644
--- a/library/think/cache/driver/Redis.php
+++ b/library/think/cache/driver/Redis.php
@@ -115,6 +115,7 @@ class Redis
      */
     public function inc($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return $this->handler->incrby($name, $step);
     }
 
@@ -127,6 +128,7 @@ class Redis
      */
     public function dec($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return $this->handler->decrby($name, $step);
     }
 
diff --git a/library/think/cache/driver/Wincache.php b/library/think/cache/driver/Wincache.php
index e8e79b47..77fb74a4 100644
--- a/library/think/cache/driver/Wincache.php
+++ b/library/think/cache/driver/Wincache.php
@@ -94,6 +94,7 @@ class Wincache
      */
     public function inc($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return wincache_ucache_inc($name, $step);
     }
 
@@ -106,6 +107,7 @@ class Wincache
      */
     public function dec($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return wincache_ucache_dec($name, $step);
     }
 
diff --git a/library/think/cache/driver/Xcache.php b/library/think/cache/driver/Xcache.php
index e58e5102..e012112f 100644
--- a/library/think/cache/driver/Xcache.php
+++ b/library/think/cache/driver/Xcache.php
@@ -94,6 +94,7 @@ class Xcache
      */
     public function inc($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return xcache_inc($name, $step);
     }
 
@@ -106,6 +107,7 @@ class Xcache
      */
     public function dec($name, $step = 1)
     {
+        $name = $this->options['prefix'] . $name;
         return xcache_dec($name, $step);
     }