Based on the Standard k-ε turbulence model，with the Reynolds averaged N-S equations and the SIMPLE algorithm，the inlet duct of the shaft tubular pump with different design parameters is simulated.The flow pattern in the inlet passage，the velocity distribution of the feature section and the hydraulic losses with different design parameters are showed in the article.On the contrast，the conclusion below can be got：（1）The smoother the lateral design line of the shaft is，the better the performance of the hydraulic losses is. （2）The velocity distribution of each case presents as a symmetrical distribution.（3）There is little difference among the hydraulic performance of the three cases.Choose case 1 as the final case，considering the economics of the project.