How to check the food safety production license number. To check the food safety production license number: 1. Search the official website of "State Food and Drug Administration" and select "food" to query relevant information. China QS Query Network can also search for relevant information by looking for corresponding items. 2. Food production license number The food production license number consists of English capital QS and 12 Arabic numerals. Among them, the first 4 Arabic digits are the acceptance agency number, which is specifically distinguished according to the administrative division code; the middle 4 Arabic digits are the product category number, which is uniformly stipulated by the General Administration of Quality Supervision, Inspection and Quarantine; the last 4 Arabic digits are the serial number of the certified enterprise for the product category. Issued by the issuing authority in the order of issuance. For example: a certain moon cake certified enterprise number in Guangzhou is: QS4401240112344401, which is the Guangzhou city zoning code. 2401 is the pastry (mooncake) product category number. 1234 is the pastry category enterprise serial number