diff --git a/mbtk/libgsw_lib/gsw_sys_interface.c b/mbtk/libgsw_lib/gsw_sys_interface.c
index 8b103ee..7aa2734 100755
--- a/mbtk/libgsw_lib/gsw_sys_interface.c
+++ b/mbtk/libgsw_lib/gsw_sys_interface.c
@@ -43,7 +43,7 @@
 int gsw_sys_svr_ssh_start(const char *cfg)
 {
 	int ret= GSW_HAL_SUCCESS;
-	char command[128] = "/usr/sbin/dropbear &";
+	char command[128] = "/usr/sbin/sshd &";
 	
 	if(NULL == cfg)
 	{	
@@ -51,7 +51,7 @@
 	}
 	else
 	{
-		sprintf(command, "/usr/sbin/dropbear %s &", cfg);
+		sprintf(command, "/usr/sbin/sshd %s &", cfg);
 		ret = system(command);
 	}
 	
@@ -67,7 +67,7 @@
 int gsw_sys_svr_ssh_stop()
 {
 	int ret = GSW_HAL_SUCCESS;
-	char command[] = "killall dropbear";
+	char command[] = "killall sshd";
 	
 	ret = system(command);
 	if(ret != 0) 
@@ -83,30 +83,42 @@
 {
 	(void)log_lvl;
 	char command[256] = {0};
+	int level = 0;
+	char *log_level_params[8] = {"emerg", "alert", "crit", "err", "warning", "notice", "info", "debug"};
+	char *log_level_values[8] = {"1", "2", "3", "4", "5", "6", "7", "8"};
 	
 	snprintf(command, sizeof(command), 
 			 "grep -q 'setprop sys.default.loglevel' %s", LOG_LEVLE_CONFIG_FILE);
 
+	for(level = 0; level < 8; level++)
+	{
+		if(0 == strcmp(log_lvl, log_level_params[level]))
+			break;
+	}
+
+	if(8 == level)
+	{
+		printf("Parameter error\n");
+		return -1;
+	}
+	
 	int exists = system(command);
 	if (exists != 0) {
 		printf("config option not exist.\n");
 		return GSW_HAL_NORMAL_FAIL;
 	}
 
-	if(1 == strlen(log_lvl))
-	{
-		snprintf(command, sizeof(command), 
-		         "sed -i 's/\\(setprop sys.default.loglevel \\)\\S*/\\1%s/' %s",
-		         log_lvl, LOG_LEVLE_CONFIG_FILE);
-		
-		int result = system(command);
-		if (result != 0) {
-		    printf("command execution failed.\n");
-		    return GSW_HAL_SUCCESS;
-		}
-
+	snprintf(command, sizeof(command), 
+	         "sed -i 's/\\(setprop sys.default.loglevel \\)\\S*/\\1%s/' %s",
+	         log_level_values[level], LOG_LEVLE_CONFIG_FILE);
+	
+	int result = system(command);
+	if (result != 0) {
+	    printf("command execution failed.\n");
+	    return GSW_HAL_SUCCESS;
 	}
 
+
 	return GSW_HAL_NORMAL_FAIL;
 }