Abstract: Based on Returning straw to soil, Effects of ability of produceing Cellulase and Hemicellulase were studied by adding carbon sources and nitrogen sources and inoculation. The results indicated that sucrose and urea were the best carbon source and nitrogen source for straw-degradation, The optimum conditions Having been obtained by orthogonal test were as following: sucrose 2.0%, urea 1.4% and inoculation 10%.