diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 018430fa..5b1c9003 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -769,7 +769,11 @@ class Query
     {
         if (empty($field)) {
             return $this;
+        } elseif ($field instanceof Expression) {
+            $this->options['field'][] = $field;
+            return $this;
         }
+
         if (is_string($field)) {
             $field = array_map('trim', explode(',', $field));
         }
@@ -1485,31 +1489,37 @@ class Query
      */
     public function order($field, $order = null)
     {
-        if (!empty($field)) {
-            if (is_string($field)) {
-                if (!empty($this->options['via'])) {
-                    $field = $this->options['via'] . '.' . $field;
-                }
-                $field = empty($order) ? $field : [$field => $order];
-            } elseif (!empty($this->options['via'])) {
-                foreach ($field as $key => $val) {
-                    if (is_numeric($key)) {
-                        $field[$key] = $this->options['via'] . '.' . $val;
-                    } else {
-                        $field[$this->options['via'] . '.' . $key] = $val;
-                        unset($field[$key]);
-                    }
-                }
+        if (empty($field)) {
+            return $this;
+        } elseif ($field instanceof Expression) {
+            $this->options['order'][] = $field;
+            return $this;
+        }
+
+        if (is_string($field)) {
+            if (!empty($this->options['via'])) {
+                $field = $this->options['via'] . '.' . $field;
             }
-            if (!isset($this->options['order'])) {
-                $this->options['order'] = [];
-            }
-            if (is_array($field)) {
-                $this->options['order'] = array_merge($this->options['order'], $field);
-            } else {
-                $this->options['order'][] = $field;
+            $field = empty($order) ? $field : [$field => $order];
+        } elseif (!empty($this->options['via'])) {
+            foreach ($field as $key => $val) {
+                if (is_numeric($key)) {
+                    $field[$key] = $this->options['via'] . '.' . $val;
+                } else {
+                    $field[$this->options['via'] . '.' . $key] = $val;
+                    unset($field[$key]);
+                }
             }
         }
+        if (!isset($this->options['order'])) {
+            $this->options['order'] = [];
+        }
+        if (is_array($field)) {
+            $this->options['order'] = array_merge($this->options['order'], $field);
+        } else {
+            $this->options['order'][] = $field;
+        }
+
         return $this;
     }