diff --git a/seeed-voicecard b/seeed-voicecard
index eb9519f..2818554 100755
--- a/seeed-voicecard
+++ b/seeed-voicecard
@@ -28,8 +28,6 @@ modprobe i2c-dev
 
 #enable spi interface
 dtparam spi=on
-sleep 1
-
 
 
 is_1a=$(i2cdetect -y  1 0x1a 0x1a | grep 1a | awk '{print $2}')
@@ -42,7 +40,6 @@ rm /var/lib/alsa/asound.state
 if [ "x${is_1a}" == "x1a" ] && [ "x${is_35}" == "x" ] ; then
     echo "install 2mic"
     dtoverlay seeed-2mic-voicecard
-    sleep 1
     rm /etc/asound.conf
     rm /var/lib/alsa/asound.state
     echo "create 2mic asound configure file"
@@ -55,7 +52,6 @@ fi
 if [ "x${is_3b}" == "x3b" ] && [ "x${is_35}" == "x" ] ; then
     echo "install 4mic"
     dtoverlay seeed-4mic-voicecard
-    sleep 1
     rm /etc/asound.conf
     rm /var/lib/alsa/asound.state
     echo "create 4mic asound configure file"
@@ -68,7 +64,6 @@ fi
 if [ "x${is_3b}" == "x3b" ] && [ "x${is_35}" == "x35" ] ; then
     echo "install 6mic"
     dtoverlay seeed-8mic-voicecard
-    sleep 1
     rm /etc/asound.conf
     rm /var/lib/alsa/asound.state
     echo "create 6mic asound configure file"