Abstract: The field experiment was conducted to study the effect of film mulching on the soil temperature , water storage and forage maize’s yield, the dynamics of biomass and N, P, K absorption by the forage maize. The result indicated that the soil temperature in cultivated layer of the field with film mulching is higher 1.85℃ than that without film before the last ten-day of July and prevented the evaporation of soil water effectively in the forage maize growth prophase. Under the treatment of film mulching the dry matter yield of forage maize and WUE (water use efficiency) were increased by 25.9% and 4.9% respectively. Forage maize with film mulching was an effective technique to use the rainfall and resolve the problem of forage shortage effectively.