SHOW TABLE STATUS and SHOW CREATE TABLE occurs messy code

The target database is utf8 character set, when i look the page Create Table Statements and Table Status,the chinese comments occurs messy code, as follows:

CREATE TABLE `tb1` (
`id` varchar(512) DEFAULT NULL COMMENT '????',
`res_name` varchar(128) DEFAULT NULL COMMENT '????',
`res_module` varchar(128) DEFAULT NULL COMMENT '????',
`res_id` int(10) NOT NULL AUTO_INCREMENT COMMENT '??id',
`method` varchar(128) DEFAULT NULL COMMENT '????',
PRIMARY KEY (`res_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='???'

what should i do something to avoid messy code ?