Straw returning has an effect on the rice soil redox character and the growth of crop in the next season under different flooding depths，while the influence degree and dynamic change characteristics are still unclear. The total amount of straw returning was simulated by the soil column culture experiment，and six depths treatments were set up，including 0 (infiltration)，1，2，4，6 and 8 cm. The dynamic changes of soil pH，conductivity(EC)，redox potential(Eh)，total reducing material，active reducing material，Fe2+and Mn2+contents during 28 days of cultivation were measured，aiming to provide a scientific basis for irrigation management of rice fields under straw returning. The results showed that soil Eh was negatively correlated with flooding depth，and decreased by 65.4%-86.4% when flooded at 1-8 cm，compared with soil infiltration treatment，while flooding depth had little effect on pH value and EC(except that the EC was significantly lower than that of each flooding treatment). The indexes showed dynamic changes with the increase of the incubation days. The soil pH value showed an upward trend within 7 days of incubation，and continued to decrease after 14 days of incubation until reaching its lowest point at 28 days. The EC value was increased with the increase of incubation time，and the largest increase was 65.3% when the water was flooded at 4 cm. Soil Eh was decreased with the incubation time，indicating that the reducibility was increasing，with the largest decrease(more than 40%)at 7-14 days. The total amount of soil reducing material，active reducing material and Fe2+content of flooding 1-2 cm treatments were significantly lower than those of flooding 4-8 cm treatments，and the decreases were 31.1%-49.5%，14.2%-54.1% and 26.3%-37.3%，respectively. The reducing compounds in the soil infiltration treatment increased gradually with the increase of incubation days，while the flooding 1-8 cm treatments increased and then decreased after 14 days of incubation. The results showed that maintaining the flooding depth at 4-6 cm in the early stage of rice straw returning could effectively alleviate the accumulation of reducing substances.