diff --git a/.gitignore b/.gitignore
index 294b402..19a5799 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,6 @@ __pycache__
 venv
 build/
 dist/
-access_token
\ No newline at end of file
+access_token
+winsw.*
+*.json
\ No newline at end of file
diff --git a/config.py b/config.py
index 696e3c6..c513791 100644
--- a/config.py
+++ b/config.py
@@ -17,6 +17,8 @@ DANMAKU_FONT_NAME = "Sarasa Term SC"
 DANMAKU_FONT_SIZE = 40
 # resolution
 VIDEO_RESOLUTION = "1280x720"
+# opacity
+DANMAKU_OPACITY = 100
 # [ffmpeg]
 # exec
 FFMPEG_EXEC = "ffmpeg"
@@ -68,13 +70,14 @@ def load_config():
     if config.has_section("danmaku"):
         section = config['danmaku']
         global DANMAKU_EXEC, DANMAKU_SPEED, DANMAKU_FONT_NAME, VIDEO_RESOLUTION, DANMAKU_FONT_SIZE, \
-            DANMAKU_USE_DANMU2ASS, DANMAKU_USE_DANMAKUFACTORY
+            DANMAKU_USE_DANMU2ASS, DANMAKU_USE_DANMAKUFACTORY, DANMAKU_OPACITY
         DANMAKU_USE_DANMU2ASS = section.getboolean('use_danmu2ass', DANMAKU_USE_DANMU2ASS)
         DANMAKU_USE_DANMAKUFACTORY = section.getboolean('use_danmakufactory', DANMAKU_USE_DANMAKUFACTORY)
         DANMAKU_EXEC = section.get('exec', DANMAKU_EXEC)
         DANMAKU_SPEED = section.getfloat('speed', DANMAKU_SPEED)
         DANMAKU_FONT_NAME = section.get('font', DANMAKU_FONT_NAME)
         DANMAKU_FONT_SIZE = section.getint('font_size', DANMAKU_FONT_SIZE)
+        DANMAKU_OPACITY = section.getint('opacity', DANMAKU_OPACITY)
         VIDEO_RESOLUTION = section.get('resolution', VIDEO_RESOLUTION)
     if config.has_section("video"):
         section = config['video']
@@ -118,6 +121,7 @@ def get_config():
             'speed': DANMAKU_SPEED,
             'font': DANMAKU_FONT_NAME,
             'font_size': DANMAKU_FONT_SIZE,
+            'opacity': DANMAKU_OPACITY,
             'resolution': VIDEO_RESOLUTION,
         },
         'video': {
diff --git a/templates/index.html b/templates/index.html
index bf2c5ce..760d7fe 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -146,6 +146,10 @@
             <td>字体大小</td>
             <td>{{ config.danmaku.font_size }}</td>
         </tr>
+        <tr>
+            <td>不透明度</td>
+            <td>{{ config.danmaku.opacity }}%</td>
+        </tr>
         <tr>
             <td>视频分辨率</td>
             <td>{{ config.danmaku.resolution }}</td>
@@ -310,6 +314,7 @@
                         speed: 0,
                         font: "",
                         font_size: 0,
+                        font_size: 100,
                         resolution: "",
                     },
                     video: {
diff --git a/workflow/danmaku.py b/workflow/danmaku.py
index 6f5e8b8..8e560a2 100644
--- a/workflow/danmaku.py
+++ b/workflow/danmaku.py
@@ -8,6 +8,7 @@ from typing import Union
 from bs4 import BeautifulSoup
 
 from config import DANMAKU_EXEC, VIDEO_RESOLUTION, DANMAKU_SPEED, DANMAKU_FONT_NAME, DANMAKU_FONT_SIZE, \
+    DANMAKU_OPACITY, \
     DANMAKU_USE_DANMU2ASS, DANMAKU_USE_DANMAKUFACTORY
 from exception.danmaku import NoDanmakuException, DanmakuFormatErrorException
 from util.file import check_file_exist
@@ -50,7 +51,7 @@ def danmaku_to_subtitle_use_danmaku_factory(file: Union[os.PathLike[str], str],
         DANMAKU_EXEC, "--ignore-warnings",
         "-r", str(VIDEO_RESOLUTION), "-s", str(DANMAKU_SPEED), "-f", "5",
         "-S", str(DANMAKU_FONT_SIZE), "-N", str(DANMAKU_FONT_NAME), "--showmsgbox", "FALSE",
-        "-O", "255", "-L", "1", "-D", "0",
+        "-O", "{:.0f}".format(DANMAKU_OPACITY*255/100), "-L", "1", "-D", "0",
         "-o", "ass", new_subtitle_name, "-i", file, "-t", str(time_shift)
     ))
 
@@ -58,7 +59,7 @@ def danmaku_to_subtitle_use_danmaku_factory(file: Union[os.PathLike[str], str],
 def danmaku_to_subtitle_use_danmu2ass(file: Union[os.PathLike[str], str], time_shift: float, new_subtitle_name: str):
     (_w, _h) = VIDEO_RESOLUTION.split("x")
     return subprocess.Popen((
-        DANMAKU_EXEC, "--force", "-a", "1", "-d", str(DANMAKU_SPEED), "--font", str(DANMAKU_FONT_NAME),
+        DANMAKU_EXEC, "--force", "-a", "{:.1f}".format(DANMAKU_OPACITY/100.0), "-d", str(DANMAKU_SPEED), "--font", str(DANMAKU_FONT_NAME),
         "--font-size", str(DANMAKU_FONT_SIZE), "--lane-size", str(DANMAKU_FONT_SIZE), "--width", _w, "--height", _h,
         "-o", new_subtitle_name, "-p", "1", "--time-offset", str(time_shift), "--width-ratio", "1", file
     ))