diff --git a/Difficult_Rocket.py b/Difficult_Rocket.py
index bb4f8fb..881f08d 100644
--- a/Difficult_Rocket.py
+++ b/Difficult_Rocket.py
@@ -54,7 +54,8 @@ if __name__ == '__main__':
 
         print(error_format['error.happen'])
         error = traceback.format_exc()
-        if (name := type(exp).__name__) in error_format:
+        name = type(exp).__name__
+        if name in error_format:
             print(error_format[name])
         else:
             print(error_format['error.unknown'])
@@ -64,4 +65,3 @@ if __name__ == '__main__':
         crash.record_thread = False
         print(crash.all_thread)
         print(crash.all_process)
-        sys.exit(1)
diff --git a/Difficult_Rocket/api/__init__.py b/Difficult_Rocket/api/__init__.py
index 6dceff4..9773e98 100644
--- a/Difficult_Rocket/api/__init__.py
+++ b/Difficult_Rocket/api/__init__.py
@@ -19,7 +19,6 @@ from .new_thread import new_thread
 # lazy之后之前全部导入的(太多了写不动__all__了)
 from .Exp import *
 from .tools import *
-from .command import *
 from .calculation import *
 from .scientific_unit import *
 
diff --git a/Difficult_Rocket/client.py b/Difficult_Rocket/client.py
index 990e769..cf5c188 100644
--- a/Difficult_Rocket/client.py
+++ b/Difficult_Rocket/client.py
@@ -26,7 +26,7 @@ if __name__ == '__main__':  # been start will not run this
     sys.path.append('/bin')
 
 # Difficult_Rocket function
-from .api import command
+from .command import command
 from .api.translate import tr
 from .fps.fps_log import FpsLogger
 from .api import tools, new_thread, translate
@@ -93,16 +93,13 @@ class ClientWindow(pyglet.window.Window):
         pyglet.resource.reindex()
         self.config_file = tools.load_file('configs/main.config')
         self.game_config = tools.load_file('configs/game.config')
-        self.FPS = Decimal(int(self.config_file['runtime']['fps']))
-        self.SPF = Decimal('1') / self.FPS
         # dic
         self.environment = {}
         self.textures = {}  # all textures
         self.runtime = {}
         # FPS
-        self.max_fps = [self.FPS, time.time()]
-        self.min_fps = [self.FPS, time.time()]
-        self.fps_wait = 5
+        self.FPS = Decimal(int(self.config_file['runtime']['fps']))
+        self.SPF = Decimal('1') / self.FPS
         self.fps_log = FpsLogger(stable_fps=int(self.FPS),
                                  wait_time=5)
         # batch
@@ -194,16 +191,9 @@ class ClientWindow(pyglet.window.Window):
 
     def FPS_update(self, tick: Decimal):
         now_FPS = pyglet.clock.get_fps()
-        if now_FPS > self.max_fps[0]:
-            self.max_fps = [now_FPS, time.time()]
-        elif now_FPS < self.min_fps[0]:
-            self.min_fps = [now_FPS, time.time()]
-        else:
-            if (time.time() - self.max_fps[1]) > self.fps_wait:
-                self.max_fps = [self.FPS, time.time()]
-            elif (time.time() - self.min_fps[1]) > self.fps_wait:
-                self.min_fps = [self.FPS, time.time()]
-        self.fps_label.text = 'FPS: {:.1f} {:.1f} ({:.1f}/{:.1f}) | MSPF: {:.5f} '.format(now_FPS, 1 / tick, self.max_fps[0], self.min_fps[0], tick)
+        self.fps_log.update_tick(tick)
+        # self.fps_label.text = 'FPS: {:5.1f} {:.1f} ({:.1f}/{:.1f}) | MSPF: {:.5f} '.format(now_FPS, 1 / tick, self.fps_log.max_fps, self.fps_log.min_fps, tick)
+        self.fps_label.text = f'FPS: {now_FPS:>10.1f} {now_FPS:.1f} {self.fps_log.max_fps:>5.1f} {self.fps_log.min_fps:>5.1f}'
 
     def on_draw(self):
         self.clear()
diff --git a/Difficult_Rocket/command/__init__.py b/Difficult_Rocket/command/__init__.py
new file mode 100644
index 0000000..0b6df53
--- /dev/null
+++ b/Difficult_Rocket/command/__init__.py
@@ -0,0 +1,12 @@
+#  -------------------------------
+#  Difficult Rocket
+#  Copyright © 2021 by shenjackyuanjie
+#  All rights reserved
+#  -------------------------------
+
+"""
+writen by shenjackyuanjie
+mail:   3695888@qq.com
+github: @shenjackyuanjie
+gitee:  @shenjackyuanjie
+"""
diff --git a/Difficult_Rocket/api/command.py b/Difficult_Rocket/command/command.py
similarity index 86%
rename from Difficult_Rocket/api/command.py
rename to Difficult_Rocket/command/command.py
index 8eeb1dd..90a2eec 100644
--- a/Difficult_Rocket/api/command.py
+++ b/Difficult_Rocket/command/command.py
@@ -17,8 +17,8 @@ from typing import Union
 from decimal import Decimal
 
 # from DR
-from . import translate
-from .new_thread import new_thread
+from ..api import translate
+from ..api.new_thread import new_thread
 
 # from libs.pyglet
 from libs import pyglet
@@ -26,10 +26,7 @@ from libs.pyglet import font
 from libs.pyglet.text import Label
 from libs.pyglet.window import key
 from libs.pyglet.gui import widgets
-from libs.pyglet.text.caret import Caret
 from libs.pyglet.graphics import Batch, Group
-from libs.pyglet.text.layout import IncrementalTextLayout
-from libs.pyglet.text.document import UnformattedDocument
 
 
 class CommandLine(widgets.WidgetBase):
@@ -97,6 +94,14 @@ class CommandLine(widgets.WidgetBase):
             label.group = Group(order=order + 1, parent=self._user_group)
         self._outline.group = Group(order=order + 2, parent=self._user_group)
 
+    """
+    values
+    """
+
+    @property
+    def value(self):
+        return self.text
+
     @property
     def text(self):
         return self._text
@@ -122,7 +127,7 @@ class CommandLine(widgets.WidgetBase):
                                实际上还有一个限制
         """
         assert type(value) is int, 'Command View must be integer'
-        assert -2 < value < self.length, f'Command View must be bigger than -1 and smaller than {self.length}'
+        assert -self.length < value < self.length, f'Command View must be bigger than {-self.length} and smaller than {self.length}'
         if value == -1:  # flush command list
             self._label.insert(0, self._label[-1])
             self._label.pop(-1)
@@ -153,12 +158,24 @@ class CommandLine(widgets.WidgetBase):
         for label in self._label:
             label.visible = value
 
-    @new_thread('command wait', log_thread=False)
-    def wait(self, wait):
+    @new_thread('command wait', daemon=True, log_thread=False)
+    def wait(self, wait: Union[float, int] = 0):
+        this = self._label[0]
         self._label[0].visible = True
         time.sleep(wait)
         if self._label[0].visible and not self.editing:
-            self._label[0].visible = False
+            while (self._label[0].opacity >= 30) and self._label[0].visible and (self._label[0] is this) and not self.editing:
+                # (label 的透明度不是 0) and (label 还在显示) and (label 还是载入线程时候的那个label) and (现在不在输入新行)
+                self._label[0].opacity -= 2
+                time.sleep(0.01)
+            if self._label[0] is this:  # 如果结束的时候label还是这个label
+                self._label[0].opacity = 255
+            else:  # 如果不是就赶快找回来！
+                now = self._label.index(this)
+                self._label[now].opacity = 255
+            if not self.editing:  # 如果不在编辑再隐藏
+                self._label[0].visible = False
+            print(self._label[0].opacity)
 
     """
     events
@@ -177,7 +194,7 @@ class CommandLine(widgets.WidgetBase):
                 if self.text:
                     self.command_view = -1
                 self.editing = False
-                self.wait(1)
+                self.wait()
             else:
                 self.text = f'{self.text[:self._text_position]}{text}{self.text[self._text_position:]}'  # 插入字符（简单粗暴）
                 self._text_position += 1
diff --git a/Difficult_Rocket/fps/fps_log.py b/Difficult_Rocket/fps/fps_log.py
index 7f905f7..94dfd0f 100644
--- a/Difficult_Rocket/fps/fps_log.py
+++ b/Difficult_Rocket/fps/fps_log.py
@@ -16,6 +16,8 @@ import decimal
 
 from decimal import Decimal
 
+from ..api.new_thread import new_thread
+
 from libs import pyglet
 
 """
@@ -34,6 +36,7 @@ class FpsLogger:
         self.wait_time = wait_time
         self.fps_list = [[stable_fps, time.time_ns()]]
 
+    # @new_thread('fps_logger update', daemon=False, log_thread=False)
     def update_tick(self,
                     tick: Decimal):
         now_time = time.time_ns()
@@ -43,6 +46,12 @@ class FpsLogger:
         if now_time - self.fps_list[0][1] >= self.wait_time * (10 ** 9):
             self.fps_list.pop(0)
 
+    def update_list(self):
+        now_time = time.time_ns()
+        for fps_time in self.fps_list:
+            if now_time - fps_time[1] >= self.wait_time * (10 ** 9):
+                del fps_time
+
     @property
     def max_fps(self):
         fps_list = [fpss[0] for fpss in self.fps_list]
diff --git a/configs/logger.json5 b/configs/logger.json5
index a602693..6fd3f07 100644
--- a/configs/logger.json5
+++ b/configs/logger.json5
@@ -35,7 +35,7 @@
   },
   'loggers': {
     'client': {
-      'level': 'INFO',
+      'level': 'DEBUG',
       'handlers': []
     },
     'server': {
diff --git a/docs/update_logs.md b/docs/update_logs.md
index 13fd5e0..c06f870 100644
--- a/docs/update_logs.md
+++ b/docs/update_logs.md
@@ -10,6 +10,12 @@
 - [![Readme-gitee](https://img.shields.io/badge/Readme-中文(点我!)-blue.svg?style=flat-square)](README-cn.md)
 - Using [SemVer 2.0.0](https://semver.org/) to manage version
 
+## 202111 V 0.6.1
+
+### Change
+
+- now command will fade away but not suddenly disappear
+
 ## 20211025 V 0.6.0 
 
 #### Command Line Update!
diff --git a/libs/pyglet/text/__init__.py b/libs/pyglet/text/__init__.py
index 33c4b30..aaa98a0 100644
--- a/libs/pyglet/text/__init__.py
+++ b/libs/pyglet/text/__init__.py
@@ -315,11 +315,11 @@ class DocumentLabel(layout.TextLayout):
 
         :type: int
         """
-        return self.color[4]
+        return self.color[3]
 
     @opacity.setter
     def opacity(self, alpha):
-        if alpha != self.color[4]:
+        if alpha != self.color[3]:
             self.color = list(map(int, (*self.color[:3], alpha)))
 
     @property