Abstract: With plastic film mulching cultivation technology promotion, the residual film for land pollution problem increasingly prominent, in order to solve the residual film on "white pollution" caused by the problem, we studied the domestic main test biodegradable film production factory production of biodegradable plastic, in the field of water, heat preservation and degrade the performance and effect on crops yield, analysis and evaluation the application effectiveness of the product. The results show that biodegradable mulch can degrade in soil, but the rate of degradation is very different. In the experiment, there is also a relatively good biodegradable film, but there are some difficulties in the production and use, such as the fracture of toughness and so on. Manufacturers in the production of biodegradable plastic that according to the natural resources around the conditions, the types of crops and labeling method, degree of mechanization, produce different grades of biodegradable plastic, to meet the production requirements.