Public signs are mainly divided into two types: food business license and small catering registration certificate. The main contents of the bulletin board include business license of business unit, food business license or small catering registration certificate, health certificate of employees, food safety commitment letter, food safety system, daily supervision and inspection information, food additive use, quantification, complaint telephone number, etc. , so as to achieve the "four unifications" of publicity content, style, specification and hanging position, which is convenient for public supervision.