diff --git a/package.json b/package.json
index 69260a1..5ef0a1c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@bd/core",
-  "version": "1.5.5",
+  "version": "1.5.6",
   "type": "module",
   "description": "百搭UI组件库的核心",
   "main": "dist/index.js",
diff --git a/src/index.js b/src/index.js
index ae1a6f8..0afd1fd 100644
--- a/src/index.js
+++ b/src/index.js
@@ -65,6 +65,7 @@ export class Component extends HTMLElement {
     }
 
     this[__props__].set(name, options)
+
     Object.defineProperty(this.prototype, name, descriptor)
   }
 
@@ -94,7 +95,10 @@ export class Component extends HTMLElement {
     super()
     this[__pending__] = false
     this[__mounted__] = false
-    this[__init__]()
+    // 这里提前定义一次, 是为了在connectedCallback之前, 就已有赋值时报错的bug
+    this[__changed_props__] = new Map() // 记录一次渲染周期内变化的属性
+    this.root = this.shadowRoot || this.attachShadow({ mode: 'open' })
+
     Object.defineProperty(this, '$refs', {
       value: Object.create(null),
       enumerable: false
@@ -104,12 +108,11 @@ export class Component extends HTMLElement {
   }
 
   [__init__]() {
-    this.root = this.shadowRoot || this.attachShadow({ mode: 'open' })
-
-    this[__changed_props__] = new Map() // 记录本次变化的属性
+    // 这里重新赋值一次, 用于清除掉因为 observer 修正产生的变化
+    this[__changed_props__] = new Map()
     // 初始化 props
     this.constructor[__props__].forEach((options, prop) => {
-      this[prop] = options.default
+      this[prop] = this[prop] === void 0 ? options.default : this[prop]
     })
 
     // 若无定义props时, 手动执行一次渲染
@@ -124,6 +127,7 @@ export class Component extends HTMLElement {
   }
 
   connectedCallback() {
+    this[__init__]()
     adoptStyles(this.root, this.constructor.styles)
 
     this[__children__]?.setConnected(true)