diff --git a/lite/proxy_lite.py b/lite/proxy_lite.py
index 9d71d64..2ff8369 100644
--- a/lite/proxy_lite.py
+++ b/lite/proxy_lite.py
@@ -1123,7 +1123,7 @@ class LoginDialog(QDialog):
         super().__init__(parent)
         self.setWindowTitle("节点配置登录")
         self.setWindowIcon(load_icon())
-        self.setFixedSize(420, 210)
+        self.setFixedSize(420, 170)
         self.setStyleSheet(f"""
             QDialog {{ background-color: {C_BG}; }}
             QLabel {{ color: {C_TEXT}; font-family: "Microsoft YaHei", "Segoe UI", sans-serif; font-size: 12px; }}
@@ -1169,9 +1169,9 @@ class LoginDialog(QDialog):
         left.addStretch()
         root.addLayout(left)
 
-        # 右侧表单
+        # 右侧表单（外层容器按内容高度垂直居中，避免被横向布局拉伸出大段留白）
         form = QVBoxLayout()
-        form.setSpacing(8)
+        form.setSpacing(6)
         self.ed_user = QLineEdit()
         self.ed_user.setPlaceholderText("登录名")
         form.addWidget(self.ed_user)
@@ -1203,7 +1203,9 @@ class LoginDialog(QDialog):
         self.btn_ok.clicked.connect(self._submit)
         bottom.addWidget(self.btn_ok)
         form.addLayout(bottom)
-        root.addLayout(form, 1)
+        box = QWidget()
+        box.setLayout(form)
+        root.addWidget(box, 1, Qt.AlignVCenter)
 
         self._done.connect(self._on_done)