Four diving tubular pumps with wet-winding stator are used in the Ehu Lake pump station at Pingxiang in Jiangxi province.The diameter of the impeller is 2 250mm.In order to investigate the effect of blade at different angles on the flow，in this paper，a specific speed ns=850 tubular pump model is kept as the research object.Based on the 3D tuibulent Navier-Stokes Equation，the internal flow of the tubular pump with different blade mounting degree and different flow are simulated by using standard k-εturbulent model.The performance prediction of pump is also completed.The results show that，head curve in steady condition is displaced upwards and efficiency curve is displaced to right.The flow in pipe is influenced by butterfly valve.In state of low flow，flow separation occurs at back of guide blade.