Straw is an important source of organic fertilizer Research the changes of the content of soil organic carbon and nitrogen during the straw returning processes It has an important significance to understand soil quality improvement During May to September，four types of fertilization were carried out in this study including control (CK)，straw (C10)，straw and nitrogenous fertilizers (C/N10，C/N20) The results showed that soil pH and moisture in C10 were lower than that in control (CK)，but other soil properties were increasing In the treatments of C10，C/N10 and C/N20，the changes tendency of soil organic carbon，pH，soil respiration and temperature were C10＞C/N10＞C/N20 Soil respiration，soil moisture and temperature were showed a decline from May to September In the principal component analysis，straw returning on soil could beneficial to improve soil organic carbon，soil total nitrogen，carbon nitrogen ratio and so on