You can't. According to the conditions of health certificate inquiry, you can't apply for a health certificate if your DNA is greater than 500. DNA belongs to hepatitis B, and a catering health certificate can only be issued if it is below the standard of 500. There are two kinds of health certificates, one is food health certificate, and the corresponding industries refer to all industries that contact or process food. The other is a general health certificate, which corresponds to employees in non-food industries including public places.