Can I get a health certificate on legal holidays?

You can't. According to the Labor Law of People's Republic of China (PRC), employees need to arrange holidays for their workers during legal holidays, and those who take vacations during legal holidays are not allowed to go to work, so they cannot apply for health certificates during legal holidays. Health certificate refers to the proof of preventive health examination, which proves that the examinee has the health quality to engage in the prescribed business.