diff --git a/MCamera/camera.py b/MCamera/camera.py
index 481d18c..c5e0285 100644
--- a/MCamera/camera.py
+++ b/MCamera/camera.py
@@ -77,7 +77,7 @@ class Camera(object):
     record_signal = False
     # 閿欒璁℃暟
     error_counting = 0
-    max_error = 5
+    max_error = 50
 
     def __init__(self):
         """Start the background camera thread if it isn't running yet."""
diff --git a/MCamera/camera_test.py b/MCamera/camera_test.py
index af2eeb7..0816608 100644
--- a/MCamera/camera_test.py
+++ b/MCamera/camera_test.py
@@ -8,7 +8,7 @@ from AcrossPlatform.get_platform import *
 def camera_is_available(source=0):
     # 根据平台导入对应的包
     if SYS_PLATFORM == WINDOWS:
-        cap = cv2.VideoCapture(source)
+        cap = cv2.VideoCapture(source, cv2.CAP_DSHOW)
     elif SYS_PLATFORM == LINUX:
         cap = cv2.VideoCapture(source, cv2.CAP_V4L2)
     else: