diff --git a/gmt-colorBar.sh b/gmt-colorBar.sh
index 0ca01e9..b6f24c8 100755
--- a/gmt-colorBar.sh
+++ b/gmt-colorBar.sh
@@ -13,19 +13,21 @@ overwriteRange='null'
 overwrite=0
 bartick="a" #色标轴标轴间隔 a表示自动
 opFile=0
+hori=''
 # 从命令行获取参数
-while getopts "hi:r:u:c:v:o" arg
+while getopts "hi:r:u:c:v:os" arg
 do
 	case $arg in
 		h)
 			dispTitle "${0##*/}" "plot a color bar using GMT script. The template accepts a grid (.nc .grid) file as input and outputs a .png and a .eps file. \
 			For further explanations, please look for GMT's manuscripts."
 			dispAuthorInfo "Yi Zhang (zhangyi.cugwuhan@gmail.com)"
-			dispUsage "${0##*/} -i<grid-data> [-r<xmin>/<xmax>/<ymin>/<ymax>] [-c<cpt-file>] [-o] [-u<unit>] [-v<bar-tick>]"
+			dispUsage "${0##*/} -i<grid-data> [-r<xmin>/<xmax>/<ymin>/<ymax>] [-c<cpt-file>] [-o] [-s] [-u<unit>] [-v<bar-tick>]"
 			dispOptionShort "-i" "input grid file."
 			dispOptionShort "-r" "data range. The template will detect the input data range automatically, the use of this option will overwrite the range."
 			dispOptionShort "-c" "color cpt, The default is rainbow."
 			dispOptionShort "-o" "open file in finder, the default is using imgcat."
+			dispOptionShort "-s" "plot the color bar horizontally."
 			dispOptionShort "-u" "data unit. The default is meter."
 			dispOptionShort "-v" "intervals of color bar's labels. the script will set the intervals automatically if -v option is not set."
 			exit 0;;
@@ -44,6 +46,8 @@ do
 			opFile=1;;
 		v)
 			bartick=$OPTARG;;
+		s)
+			hori='+h';;
 		?)
 			printf "error: unknow argument\nuse -h option to see help information\n"
 			exit 1;;
@@ -81,9 +85,9 @@ else
 	#-C${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
 	if [[ ${unit} == 'km+Uk' ]]; then
-		gmt psscale -Dx1.6i/0.1i+w1.2i/0.07i+h -C${cptfile}+Uk -Bx${bartick} -By+l${unit} > $psfile
+		gmt psscale -Dx1.6i/0.1i+w1.2i/0.07i${hori} -C${cptfile}+Uk -Bx${bartick} -By+l${unit} > $psfile
 	else
-		gmt psscale -Dx1.6i/0.1i+w1.2i/0.07i+h -C${cptfile} -Bx${bartick} -By+l${unit} > $psfile
+		gmt psscale -Dx1.6i/0.1i+w1.2i/0.07i${hori} -C${cptfile} -Bx${bartick} -By+l${unit} > $psfile
 	fi
 	gmt psconvert $psfile -A -TEG -E500
 	# 删除临时文件 使用linux终端rm命令