In order to understand the effect of different magnitudes of straw returned into field on soil nutrients,the experiment was conducted in 2010 in long-term located experimental field of Gongzhuling under different planting systems. The experimental straw amounts included 1/2 times, 1 times, 2 times and 4 times. The nutrient indicators including total N, available N, total P, available P, total K, available K, soil organic matter and pH were measured. The results showed that the contents of total N, available N increased with of straws because straws were returned into field. In addition, P and K in soil increased significantly in two planting systems with increase of straw magnitudes. Meanwhile,straw returned into flied improved soil organic matter from 9.79% to 24.55% and from 4.52% to 11.22% under conventional tillage and wide-narrow lines, respectively. Soil pH decreased with of increase of straws. It indicated that increasing of soil organic matter would moderate pH effectively. For this reason,soil nutrients were improved, capacity of soil was enhanced and sequestering C capacity was increased because of good soil environment formed by straws returned into field.