In order to clarify the effect of different flooding treatments on rice growth law and yield in cold region, simulation of flooding stress status was conducted through rice flooding test, and the law of tillering, plant height and yield of rice under different flooding depths and flooding durations was analyzed. The results show that when the flooding depth is 1/3 h, stem tiller extinction amplitude is less than the control treatment, and the stem tiller extinction amplitude of the flooding duration of 7 d is less than that of flooding duration of 3d.When the flooding depth is 2/3 h and 3/3 h,with the extension of flooding duration, the extent of stem tiller extinction amplitude gradually increased. When the depth of flooding gradually increased, the greater the height of rice plant growth was, the longer the flooding lasted, the more obvious the increase of plant height was. The plant height increased by a maximum of 15.4 cm, 5.8 cm higher than the control treatment. Long-time total flooding(3/3 h-7 d treatment)had the most harmful effect on the yield of rice, and the yield was reduced by 46.63%.The results may provide a data basis for establishing the threshold index of flooding disaster and assessing the impact of floods.