This paper discusses from two aspects of case writing and PBL implementation experience. PBL cases should be based on professional requirements and reflect professional characteristics. Health inspection and quarantine cases targeted at application-oriented talent cultivation can be integrated into relevant experimental skills items. At the same time

the forms of case writing are expanded according to the differences of theme forms

which are designed as parallel cases and serial cases

so as to be applicable to the curriculum integration in different areas. In the implementation of PBL teaching

students' learning status is the key to the efficiency of classroom discussion

which determines whether the implementation of PBL is completely autonomous learning or embedded instruction. Teachers should establish cooperative learning atmosphere to improve the efficiency of classroom discussion