diff --git a/gmtsph-global.sh b/gmtsph-global.sh
index 77fbc41..fc8a1ad 100755
--- a/gmtsph-global.sh
+++ b/gmtsph-global.sh
@@ -9,6 +9,7 @@ data='null'
 gridData='null'
 unit='m'
 color='rainbow'
+direct_cpt='user.cpt'
 range='null'
 overwriteRange='null'
 overwrite=0
@@ -18,7 +19,7 @@ clon=0
 polyfile='null'
 bartick="a" #色标轴标轴间隔 a表示自动
 # 从命令行获取参数
-while getopts "hi:r:u:c:a:G:l:p:v:g" arg
+while getopts "hi:r:u:c:C:a:G:l:p:v:g" arg
 do
 	case $arg in
 		h)
@@ -31,6 +32,7 @@ For futher explanations, please look for GMT's manuscripts."
 			dispOptionShort "-l" "central longitude value of the plot, the default value is 0"
 			dispOptionShort "-u" "data unit. The default is meter. use 'km+Uk' to append '+Uk' option to the psscale command"
 			dispOptionShort "-c" "color cpt. The default is rainbow."
+			dispOptionShort "-C" "color cpt. Use the input cpt file directly."
 			dispOptionShort "-v" "intervals of color bar's labels. the script will set the intervals automatically if -v option is not set."
 			dispOptionShort "-a" "axis labels. The deafults are x (m) and y (m)."
 			dispOptionShort "-g" "use grdgradient. The default is false."
@@ -43,6 +45,8 @@ For futher explanations, please look for GMT's manuscripts."
 			unit=$OPTARG;;
 		c)
 			color=$OPTARG;;
+		C)
+			direct_cpt=$OPTARG;;
 		r)
 			overwrite=1
 			overwriteRange=$OPTARG;;
@@ -69,7 +73,7 @@ if [[ $data == "null" ]]; then
 	exit 1
 else
 	# 初始化临时文件名
-	cptfile=user.cpt
+	cptfile=${direct_cpt}
 	psfile=${data%.*}.ps
 	jpgfile=${data%.*}.png
 	# 获取网格范围
@@ -90,7 +94,10 @@ else
 	MAP_FRAME_AXES=WESnZ \
 	MAP_LABEL_OFFSET=2.5p
 
-	gmt grd2cpt ${data} -C${color} -Z -D > $cptfile
+	if [[ $cptfile == 'user.cpt' ]]; then
+		gmt grd2cpt ${data} -C${color} -Z -D > $cptfile
+	fi
+	
 	if [[ $plotgrad == 1 ]]; then
 		gradfile=${data%.*}Grad.nc
 		if [[ $gridData == 'null' ]]; then
@@ -103,7 +110,9 @@ else
 		gmt grdimage ${data} -R${range} -C${cptfile} -Bxag+l"${labels[0]}" -Bpya40g40+l"${labels[1]}" -JN${clon}/2i -K -P > $psfile
 	fi
 	if [[ $polyfile != 'null' ]]; then
-		gmt psxy $polyfile -JN${clon}/2i -R${range} -L -K -O >> $psfile
+		#-L force closed polygon
+		#gmt psxy $polyfile -JN${clon}/2i -R${range} -L -K -O >> $psfile
+		gmt psxy $polyfile -JN${clon}/2i -R${range} -W0.1p -K -O >> $psfile
 	fi
 	#-C${cptfile}+Uk 使用km（色标单位除1000
 	#如果unit等于km则在cptfile后面添加+Uk
@@ -114,7 +123,10 @@ else
 	fi
 	gmt psconvert $psfile -A -TEG -E300
 	# 删除临时文件 使用linux终端rm命令
-	rm $cptfile $psfile gmt.history gmt.conf
+	if [[ $cptfile == 'user.cpt' ]]; then
+		rm $cptfile
+	fi
+	rm $psfile gmt.history gmt.conf
 	if [[ $plotgrad == 1 ]]; then
 		rm $gradfile
 	fi