Based on soil conservation and ecological effect of plastic mulching and straw cover，integration wheat straw and plastic film composite system，the process，yield，water consumption and efficiency are analyzed，the level of soil organic matter of corn has been improved under different kinds of coverage． The results show that the effect of the growth period of wheat straw and plastic film composite cover the wheat straw mulching and no mulching treatment early around 10 d，its water consumption is relatively small，has the function of water conservation，reduces ineffective evaporation． Compared with no cover processing，plastic film mulching reduces water consumption by 38．6 mm，composite cover reduces water consumption by 44． 0 ～ 59． 6 mm． The treatment of plastic film mulching water use efficiency increases by 41．0%，composite cover increases by 20． 8% ～ 30． 1%． Compared with previous sowing composite cover promoting the soil，organic matter content increases by 8．62% ～ 14．94%． Improving the wheat straw utilization has positive effects，and has solved the straw mulching technology in popularization and application of“cold environment + low emergence+ low output”．