In order to understand effects of straws returned into field on maize growth and development and yield and select proper mode of straws returned into field, the long-term located experiment about returned straws was designed in 2000. Indexes of plant growth and development and crop yield components were determined and analyzed. The results showed that deep tillage combined straws returned into field created a better soil environment for growth and development of maize. Leaf areas per plant of maize were increased, and capacity of photosynthesis was improved, so the dry matter accumulation promoted and yield enhanced. The data showed that yields of treatments of deep tillage, high stubble, crush straws returned into field, and belt cover increased by 8.27%, 13.50%, 13.59 and 10.07% compared with conventional tillage.