Gear pump is an important hydraulic part and it’〖KG-*2〗s used in many real projects. Combining finite analysis with test, a kind of external gear pump was taken as example,then the consistency of CFD analysis results and test results was verified. The results indicate the analysis results are consistent with the test results.The research for the outlet flux proves the analysis model is correct.This method can cut down design cycle and give vital data for the structure design of gear pump.