diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index e53cdacb..6c64a074 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -403,7 +403,7 @@ class Query
             if (empty($this->options['table'])) {
                 $this->options['table'] = $this->getTable();
             }
-            $key    = is_string($cache['key']) ? $cache['key'] : md5($field . serialize($this->options) . serialize($this->bind));
+            $key    = is_string($cache['key']) ? $cache['key'] : md5($this->connection->getConfig('database') . '.' . $field . serialize($this->options) . serialize($this->bind));
             $result = Cache::get($key);
         }
         if (false === $result) {
@@ -447,7 +447,7 @@ class Query
             if (empty($this->options['table'])) {
                 $this->options['table'] = $this->getTable();
             }
-            $guid   = is_string($cache['key']) ? $cache['key'] : md5($field . serialize($this->options) . serialize($this->bind));
+            $guid   = is_string($cache['key']) ? $cache['key'] : md5($this->connection->getConfig('database') . '.' . $field . serialize($this->options) . serialize($this->bind));
             $result = Cache::get($guid);
         }
         if (false === $result) {
@@ -2322,7 +2322,7 @@ class Query
             // 判断查询缓存
             $cache = $options['cache'];
             unset($options['cache']);
-            $key       = is_string($cache['key']) ? $cache['key'] : md5(serialize($options) . serialize($this->bind));
+            $key       = is_string($cache['key']) ? $cache['key'] : md5($this->connection->getConfig('database') . '.' . serialize($options) . serialize($this->bind));
             $resultSet = Cache::get($key);
         }
         if (false === $resultSet) {
@@ -2463,11 +2463,11 @@ class Query
             // 判断查询缓存
             $cache = $options['cache'];
             if (true === $cache['key'] && !is_null($data) && !is_array($data)) {
-                $key = 'think:' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
+                $key = 'think:' . $this->connection->getConfig('database') . '.' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
             } elseif (is_string($cache['key'])) {
                 $key = $cache['key'];
             } elseif (!isset($key)) {
-                $key = md5(serialize($options) . serialize($this->bind));
+                $key = md5($this->connection->getConfig('database') . '.' . serialize($options) . serialize($this->bind));
             }
             $result = Cache::get($key);
         }