Abstract: Based on the numerical simulation of different discharges,water level and velocity distribution of a ship lock approach channel entrance and abutment are studied with a large angle between the mainstream of the river and the central line of the approach channel.The calculated results show that the channel entrance at all levels has oblique flow influencing navigation,and the maximum navigable flow is determined as 4 000 m3/s after analysis of navigation conditions,which can be improved by deceasing the above angle.Comparison with physical model experiment results show that this numerical model can well simulate the flow conditions of the approach channel entrance.