For the purpose of improving transportation efficiency and preventing slurry siltation,internal flow field analysis for dredging head of trailing suction hopper dredger(TSHD)is conducted by CFD method.Model of multi-phase flow and boundary conditions are set on considering features of slurry flow in the dredging head.An optimized design of dredging head modification according to the streamline is proposed on the basis of CFD analysis.Comparing with original design,optimized design enjoys lesser flow resistance and vortex flow.