diff --git a/library/think/cache/driver/Redis.php b/library/think/cache/driver/Redis.php
index 90da6551..a796fb09 100644
--- a/library/think/cache/driver/Redis.php
+++ b/library/think/cache/driver/Redis.php
@@ -132,8 +132,12 @@ class Redis extends Driver
      */
     public function inc($name, $step = 1)
     {
-        $key = $this->getCacheKey($name);
-        return $this->handler->incrby($key, $step);
+        if ($this->has($name)) {
+            $value = $this->get($name) + $step;
+        } else {
+            $value = $step;
+        }
+        return $this->set($name, $value, 0) ? $value : false;
     }
 
     /**
@@ -145,8 +149,12 @@ class Redis extends Driver
      */
     public function dec($name, $step = 1)
     {
-        $key = $this->getCacheKey($name);
-        return $this->handler->decrby($key, $step);
+        if ($this->has($name)) {
+            $value = $this->get($name) - $step;
+        } else {
+            $value = -$step;
+        }
+        return $this->set($name, $value, 0) ? $value : false;
     }
 
     /**
diff --git a/tests/thinkphp/library/think/cache/driver/redisTest.php b/tests/thinkphp/library/think/cache/driver/redisTest.php
index 839e5165..a5a36d40 100644
--- a/tests/thinkphp/library/think/cache/driver/redisTest.php
+++ b/tests/thinkphp/library/think/cache/driver/redisTest.php
@@ -41,7 +41,7 @@ class redisTest extends cacheTestCase
         $cache = $this->prepare();
         $this->assertEquals('string_test', $cache->get('string_test'));
         $this->assertEquals(11, $cache->get('number_test'));
-        $result =  $cache->get('array_test');
+        $result = $cache->get('array_test');
         $this->assertEquals('array_test', $result['array_test']);
     }
 
@@ -53,11 +53,11 @@ class redisTest extends cacheTestCase
 
         $redis->handler()->setnx('key', 'value');
         $value = $redis->handler()->get('key');
-        $this->assertEquals('value', $value);
-        
+        $this->assertEquals('s:5:"value";', $value);
+
         $redis->handler()->hset('hash', 'key', 'value');
         $value = $redis->handler()->hget('hash', 'key');
-        $this->assertEquals('value', $value);
+        $this->assertEquals('s:5:"value";', $value);
     }
 
     public function testExpire()