diff --git a/library/think/db/driver.php b/library/think/db/driver.php
index 0fdc6460..780787fb 100644
--- a/library/think/db/driver.php
+++ b/library/think/db/driver.php
@@ -153,7 +153,7 @@ abstract class Driver
         $this->queryStr = $str;
         if (!empty($this->bind)) {
             $that           = $this;
-            $this->queryStr = strtr($this->queryStr, array_map(function ($val) use ($that) {return '\'' . $that->escapeString($val) . '\'';}, $this->bind));
+            $this->queryStr = strtr($this->queryStr, array_map(function ($val) use ($that) {return $that->escapeString($val);}, $this->bind));
         }
         if ($fetchSql) {
             return $this->queryStr;
@@ -213,7 +213,7 @@ abstract class Driver
         $this->queryStr = $str;
         if (!empty($this->bind)) {
             $that           = $this;
-            $this->queryStr = strtr($this->queryStr, array_map(function ($val) use ($that) {return '\'' . $that->escapeString($val) . '\'';}, $this->bind));
+            $this->queryStr = strtr($this->queryStr, array_map(function ($val) use ($that) {return $that->escapeString($val);}, $this->bind));
         }
         if ($fetchSql) {
             return $this->queryStr;
@@ -454,7 +454,7 @@ abstract class Driver
     protected function parseValue($value)
     {
         if (is_string($value)) {
-            $value = strpos($value, ':') === 0 && in_array($value, array_keys($this->bind)) ? $this->escapeString($value) : '\'' . $this->escapeString($value) . '\'';
+            $value = strpos($value, ':') === 0 && in_array($value, array_keys($this->bind)) ? $value : $this->escapeString($value);
         } elseif (isset($value[0]) && is_string($value[0]) && strtolower($value[0]) == 'exp') {
             $value = $this->escapeString($value[1]);
         } elseif (is_array($value)) {