Based on numerical simulations, the feasibility of disturbing the bottom saline water wedge to control saline water intrusion by water curtain method is studied. The results show that the concentration of the bottom saline water can be effectively reduced by setting level jets in the deep channel of the upper reach; The position of the best saline water intrusion control effect is near the bottom of the high saline water mass; There is an optimal water flow value. When water flow is less than the value, saline water intrusion length increases with the decrease of flow. When water flow is more than the value, saline water intrusion length increases with the increase of flow. Further studies show that the best phase of disturbing the saline water wedge is setting level jets during neap tide. Low salinity contours(≤0. 5‰)retreat to the sea apparently, which is beneficial to the water intake.