diff --git a/library/think/db/Builder.php b/library/think/db/Builder.php
index d579e9b9..e07e51e7 100644
--- a/library/think/db/Builder.php
+++ b/library/think/db/Builder.php
@@ -311,7 +311,7 @@ abstract class Builder
             $whereStr .= $key . ' ' . $exp . ' ' . $this->parseValue($value);
         } elseif ('EXP' == $exp) {
             // 表达式查询
-            $whereStr .= $key . ' ' . $value;
+            $whereStr .= '( ' . $key . ' ' . $value . ' )';
         } elseif (in_array($exp, ['NOT NULL', 'NULL'])) {
             // NULL 查询
             $whereStr .= $key . ' IS ' . $exp;
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index b54e84d4..26ab13cc 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -491,7 +491,13 @@ class Query
         if (is_string($field) && !empty($this->options['via'])) {
             $field = $this->options['via'] . '.' . $field;
         }
-        if (is_null($op) && is_null($condition)) {
+        if (is_string($field) && strpos($field, ' ')) {
+            $where[] = ['exp', $field];
+            if (is_array($op)) {
+                // 参数绑定
+                $this->bind($op);
+            }
+        } elseif (is_null($op) && is_null($condition)) {
             if (is_array($field)) {
                 // 数组批量查询
                 $where = $field;