Axial flow pumpunstablezone existsnot only affect thereliable operation of thepump units,but also reduce theoperating range ofaxial flow pumpefficientarea.Based on themaster's thesis"axial flow pumpof non"improve the mechanical properties andstabilitycondition flowmechanism,the main use of ICEM-CFD,CFX software,combined with the excelworksheet,modifyingthemodelhas been built,and then tomesh,is calculatedfor differentconditions,using CFXafter treatmentwaspump performance parametersand thevelocity,pressurecontours,import the data into the exceldraw thecharacteristic curve of pump.The resultsshow that:(1)the small flow rate condition,theimportand baffle,pump headincreased significantly;(2)theimportand baffle,axial flow pumpunstable region(saddle area)rangesignificantly reduced;(3)the entranceand baffleis smalland efficiencyofaxial floweffectpump;(4)with the increase of flow rate,inlet flow field,pressure fieldis more uniform.Keywords:baffle,unstable region,after CFXtreatment,flow field,pressure field

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