In order to solve the problem of“white pollution”caused by long-term plastic filmmulching，experiments ofdrip irrigation under biodegradable plastic film，liquid plastic film and common plastic film were carried out to investigate the degradation of different plastic film mulching and its effects on soil water and heat changes and maize yield. The results showed that the biodegradable plastic film with EBP as the main component between different degradable plastic films had abetter effect on increasing temperature and preservingmoisture，which was lower than that of ordinary plastic filmtreatment， but significantly higher than that of bare land treatment. The yield of biodegradable film with EBP as the main component wasthe highest among different mulchingtreatments，followed by liquidfilm，and the yield of biodegradable film with PBSA as the main component was the lowest. The application of biodegradable plastic film with EBP as the main component in dripirrigation maize field under mulch effectively reduced“white pollution”，and the yield was significantly higher than that ofcommon plastic film mulchingtreatment，so it can be popularized and applied in western Liaoning province.