In order to solve the problem that the upper and lower reaches of Hadashan hub of Songhua River cannot be continuously navigable without any navigational facilities,we use the water flow mathematical model to study the navigation flow characteristics of the reach from Hadashan to the Songyuan rolling dam.We validate the model by measured data,simulate the current status water flow of the river,analyze the navigation flow characteristics,simulate and study the scheme of connecting the upstream and downstream navigation technologies of the Hadashan hydro-junction,and obtain the navigation flow characteristic parameters.The results show that it can be solved that navigation problem of upstream and downstream connection for Hadashan hydro-junction by technology scheme of constructing ship lock or port in the upstream and downstream of the hydro-junction.It can provide references for the similar projects.