diff --git a/src/auth/pool_passwd.c b/src/auth/pool_passwd.c
index 3a9107bc..f1c1dde3 100644
--- a/src/auth/pool_passwd.c
+++ b/src/auth/pool_passwd.c
@@ -680,3 +680,46 @@ read_pool_key(char *key_file_path)
 
 #undef LINELEN
 }
+
+/*
+ * Check password type is md5 hashed or not. recovery_password and
+ * wd_lifecheck_password are not allowed to be md5 hashed format.
+ * The kind of returns of this function is follow;
+ *  0: password is not md5 hashed
+ * -1: password is md5 hashed
+ * -2: password is not found
+ */
+int
+chceck_password_type_is_not_md5(char *username, char *password_in_config)
+{
+	PasswordType passwordType = PASSWORD_TYPE_UNKNOWN;
+	PasswordMapping *password_mapping = NULL;
+
+	/*
+	 * if the password specified in config is empty string or NULL look for the
+	 * password in pool_passwd file
+	 */
+	if (password_in_config == NULL || strlen(password_in_config) == 0)
+	{
+		password_mapping = pool_get_user_credentials(username);
+		if (password_mapping == NULL)
+		{
+			return -2;
+		}
+		passwordType = password_mapping->pgpoolUser.passwordType;
+		password = password_mapping->pgpoolUser.password;
+	}
+	else
+	{
+		passwordType = get_password_type(password_in_config);
+		password = password_in_config;
+	}
+
+	/* if the password type is MD5 hash return -1*/
+	if (passwordType == PASSWORD_TYPE_MD5)
+	{
+		return -1;
+	}
+
+	return 0;
+}
\ No newline at end of file
diff --git a/src/include/auth/pool_passwd.h b/src/include/auth/pool_passwd.h
index bbcaaa81..9ec244b3 100644
--- a/src/include/auth/pool_passwd.h
+++ b/src/include/auth/pool_passwd.h
@@ -85,4 +85,5 @@ extern char *get_decrypted_password(const char *shadow_pass);
 extern char *read_pool_key(char *key_file_path);
 extern char *get_pgpool_config_user_password(char *username, char *password_in_config);
 extern void delete_passwordMapping(PasswordMapping * pwdMapping);
+extern int chceck_password_type_is_not_md5(char *username, char *password_in_config);
 #endif							/* POOL_PASSWD_H */
diff --git a/src/pcp_con/recovery.c b/src/pcp_con/recovery.c
index 088826b7..75fa7d01 100644
--- a/src/pcp_con/recovery.c
+++ b/src/pcp_con/recovery.c
@@ -85,6 +85,14 @@ start_recovery(int recovery_node)
 		ereport(ERROR,
 				(errmsg("node recovery failed, node id: %d is alive", recovery_node)));
 
+	if(chceck_password_type_is_not_md5(pool_config->recovery_user, pool_config->recovery_password) == -1)
+	{
+		ereport(ERROR,
+				(errmsg("the password of recovery_user %s is invalid format",
+						pool_config->recovery_user),
+				errdetail("recovery_password is not allowed to be md5 hashed format")));
+	}
+
 	/* select main/primary node */
 	node_id = MAIN_REPLICA ? PRIMARY_NODE_ID : REAL_MAIN_NODE_ID;
 	backend = &pool_config->backend_desc->backend_info[node_id];
diff --git a/src/watchdog/wd_lifecheck.c b/src/watchdog/wd_lifecheck.c
index 1f2fd3af..a51e8ef0 100644
--- a/src/watchdog/wd_lifecheck.c
+++ b/src/watchdog/wd_lifecheck.c
@@ -387,6 +387,14 @@ lifecheck_main(void)
 	/* Identify myself via ps */
 	init_ps_display("", "", "", "");
 
+	if(chceck_password_type_is_not_md5(pool_config->wd_lifecheck_user, pool_config->wd_lifecheck_password) == -1)
+	{
+		ereport(ERROR,
+				(errmsg("the password of wd_lifecheck_user %s is invalid format",
+						pool_config->recovery_user),
+				errdetail("wd_lifecheck_password is not allowed to be md5 hashed format")));
+	}
+
 	pool_signal(SIGTERM, lifecheck_exit_handler);
 	pool_signal(SIGINT, lifecheck_exit_handler);
 	pool_signal(SIGQUIT, lifecheck_exit_handler);