Mangniushao Beach is a major obstruction to navigation in the middle reaches of Songhua River.The shallow channel，narrow channel and rapid flow at the mouth of the beach，accompanied by cross-flow and other obstruction to navigation，have seriously affected the navigation of ships and the construction of eco-tourism channel.To solve this problem，two-dimensional numerical simulation is used to study the characteristics of the obstructing current in Mangniushao reach，and the effects of three channel regulation schemes are compared and analyzed.The results show that the navigable water depth of the beach section is greater than 1.78 m，the average slope in dry season is only 0.29‰，and the average hydraulic parameter of rapids abating is far less than 2.06.The flow pattern is good and meets the requirements of channel management.The research results can provide scientific basis for the selection of channel regulation scheme of this kind of beach.