With a certain type of long servicelife astronautical centrifugal pump that had similar specific speed used as the model pump,a centrifugal pump was designed through integrated methods of the ensemble similarity conversion,threedimensional whole flow field and multiple load numerical simulation of ANSYSY-Fluent software and hydraulic characteristic test.The results indicate that compared with the model pump,the maximum power point of the engineered pump offsets to large flow conditions and there is higher positive power slope.It also shows that while the peak efficiency points of both the engineered pump B and the model pump are under 1.02 times rated flow conditions,the highefficiency area of the engineered pump B is wider and more stable than the model pump.However,in the low flow area,the model pump is more efficient than engineered pump A,B;the variation slopes are different:the positive slope of the engineered pump A,B is bigger than the model pump.In the high flow area,the engineered pump A,B are more efficient than the model pump.At 0.76 times rated flow point of the engineered pump,the model pump intersects with the engineered pump B and they present diverse variation trends where the positive efficiency slope of the engineered pump B is higher than the model pump.By magnifying the engineered pump in the range of 0.5~1.5 times rated flow,its exit pressure and power show a consistent variation trend as the model pump,accompanied by evidently increased efficiency.Therefore,the engineered pump and model pump comply with the criteria of similarity conversion.