Abstract: To solve the problems of plastic pollution in environment and biomass residue disposal, we carried on the coated experiment using the biodegradable mulch film by reusing biomass residue. In this experiment the effect of biodegradable mulch film on corn growth and its degradation in field was studied. The results showed that, the degradation of mulch films started with small cracks, then the small holes growing, and finally broken down to a lot of pieces at crop harvest stage. During the degradation, the film would be more brittle and thinner, and the black mould would be appeared in the film surface. After 120 days, the weight loss of the film was about 69%-73%. Observation of SEM revealed that the surface of biodegradable mulch films had obvious flaw at this time. At early and middle stage of corn growth, biodegradable mulch films had obvious effect on heat and moisture preservation. The heat preservation could last about 50 days, and the moisture effect could last about 70 days. The degradable mulch films were rich in nutrients, and the films could improve corn yields. This experiment showed that, the degradable mulch films were good in degradation and could promote the growth of corn.