In the eutrophication process of Wuli Lake, large amount of nitrogen, phosphorous and organic matter accumulated in the sediment of the lake bottom. In summer, oxygen deficiency often occurred in the sediment and bottom water, because high temperature enhanced biochemical oxygen consumption in the sediment and water, but the high water level greatly limited oxygen supply of the bottom water and sediment. The sediment condition was suitable for emerged plant and floating-leaved plant all the time, and even favorite to submerged plant when the temperature was below 30℃ or the water depth was less than 1m. In summer season when the temperature was over 30℃ and the water depth was beyond 1m, the anaerobic condition in the sediment and bottom water could destroy the root of submerged plant and cause it floating-up. It became an obstacle for restore aquatic vegetation in Wuli Lake that submerged plant could not survive the summer. To create suitable habitat for aquatic plant in Wuli Lake, the water level should be controlled, and the fertile sediment in the center of the lake be moved to the littoral zone to make it more shallow.