diff --git a/extend/base/admin/controller/system/ConfigBase.php b/extend/base/admin/controller/system/ConfigBase.php
index d5e00f6..b263cb8 100644
--- a/extend/base/admin/controller/system/ConfigBase.php
+++ b/extend/base/admin/controller/system/ConfigBase.php
@@ -36,13 +36,16 @@ class ConfigBase extends AdminController
     public function save()
     {
         $this->checkPostRequest();
-
         $post = $this->request->except(['group_name'], 'post');
-
         $group_name = $this->request->post('group_name');
+        $storage_bytes_keys = ['upload_allow_size'];
 
         try {
             foreach ($post as $key => $val) {
+
+                if (in_array($key, $storage_bytes_keys)) {
+                    $val = parse_bytes($val);
+                }
                 if (empty($group_name)) {
                     $this->model
                         ->where('name', $key)
diff --git a/extend/base/admin/view/system/config/upload.html b/extend/base/admin/view/system/config/upload.html
index 0f6b1de..fd20e04 100644
--- a/extend/base/admin/view/system/config/upload.html
+++ b/extend/base/admin/view/system/config/upload.html
@@ -20,7 +20,7 @@
     <div class="layui-form-item">
         <label class="layui-form-label required">允许大小</label>
         <div class="layui-input-block">
-            <input type="text" name="upload_allow_size" class="layui-input" lay-verify="required" lay-reqtext="请输入允许上传大小" placeholder="请输入允许上传大小" value="{:sysconfig('upload','upload_allow_size')}">
+            <input type="text" name="upload_allow_size" autocomplete="off" class="layui-input" lay-verify="required" lay-reqtext="请输入允许上传大小" placeholder="请输入允许上传大小" value="{:format_bytes(sysconfig('upload','upload_allow_size'))}">
             <tip>设置允许上传大小。</tip>
         </div>
     </div>
diff --git a/extend/base/helper.php b/extend/base/helper.php
index 1980e1e..228c2ea 100644
--- a/extend/base/helper.php
+++ b/extend/base/helper.php
@@ -353,13 +353,44 @@ function array_to_table($array_tree, $prefix_key = '')
 
 function format_bytes($size, $delimiter = '')
 {
+    if (is_null($size)) {
+        return '0B';
+    }
     $units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
     for ($i = 0; $size >= 1024 && $i < 5; $i++) {
         $size /= 1024;
     }
-
     return round($size, 2) . $delimiter . $units[$i];
 }
+function parse_bytes($size)
+{
+    $unit = strtolower(substr($size, -1));
+    $size = (int) $size;
+    switch ($unit) {
+        case 'b':
+            break;
+        case 'k':
+            $size *= 1024;
+            break;
+        case'm':
+            $size *= 1024 * 1024;
+            break;
+        case 'g':
+            $size *= 1024 * 1024 * 1024;
+            break;
+        case 't':
+            $size *= 1024 * 1024 * 1024 * 1024;
+            break;
+        case 'p':
+            $size *= 1024 * 1024 * 1024 * 1024 * 1024;
+            break;
+        default:
+            return $size;
+    }
+
+    return $size;
+}
+
 
 function get_store_value($key, $default = null)
 {