Item 25 of Law on Food Hygiene stipulates the legal system of certificate claiming and clearly defines the forms of certificate claiming to be quality certificate and laboratory test report. This article analyses some important problems,which appear during the implementation of this legal system,such as the form of quality certificate,the qualification of foodstuff enterprise to offer the certificate,the scope of certificate claiming,the dealing with violation,and so on. This article stresses reasonable scope for certificate claiming,classified management,accordance with reality and appropriate leniency and sternness when dealing with violation of the legal system. At the same time,the legal position of quality certificate and the certificate offering of foodstuff enterprise during executing the law should be officially affirmed. Besides,the right and obligation of the food producer and the purchaser and the management of sanitation supervising organization were also discussed.