Abstract:The yield characteristics and soil physical property were analyzed under the different straw returning patterns in order to discuss the reason for maize yield differences of different straw returning pattern, which would provide theoretical basis and technical support for maize straw returning effectively in different ecological regions of Heilongjiang Province. The conventional ridge farming mode(CK), no-tillage flat farming pattern with straw covering surface soil(J1), field ploughing pattern with straw turning in surface soil(J2) and field flat farming pattern with straw mixing in surface soil(J3) were set up by large area contrast design using Jingnongke 728 as experimental material. Yields of different straw returning pattern was J2>J1>J3>CK, and yield increase of J2was the largest, which was 8.70%; the yield under different straw returning pattern was negatively and significantly negatively correlated with spike number and grain number per spike, and was positively and significantly correlated with 1,000-grain weight,with the largest increase of 11.89% in J2. The hydrothermal condition of J3 was the best in the early growing period.The soil physical properties of J2were the best during the critical period of growth and development. In particular,the bulk density of surface soil decreased at 10-30 cm, and the soil porosity and>1 mm granule structure all increased most significantly. Suitable straw returning pattern can promote the growth and development of maize and improve the physical properties of surface soil in the key growth period, and then improve yield of maize. In this study, it was recommended that the best pattern for maize straw returning to the field in the first accumulative temperate zone of Heilongjiang Province was field ploughing pattern with straw turning in surface soil.