Abstract: A field trial was conducted to study the degradation characteristics of different mulch and the effect on soil temperature, moisture and yield of potato in Jimo Vegetable Science and Technology Demonstration Plot. The results showed that the degradation effect of bio-degradable film was the best, the degradation level of 0.006, 0.008 and 0.010 mm bio-degradable film reached 5, 4 and 3 grade before harvest, while the PE film only degraded to the level of grade 1. Bio- degradable film had better effect on raising temperature and retaining moisture, but less than that of PE film. Compared with no film treatment, 0.006, 0.008 and 0.010 mm bio-degradable film and PE film could increase the yield by 12.9%, 33.3%, 33.6% and 14.9%. The results indicated that bio-degradable film increased soil temperature and potato yield, degraded fast, had no artificial cleanup cost and had less pollution. Considering the price of different types of bio-degradable films, 0.008 mm is more suitable for potato planting in Qingdao, which has obvious yield-increasing effect and could offer substitute products of membrane pollution regulation, and is benefit to control agricultural non-point source pollution.