Abstract: Taking the characteristic curve conversion diagram of centrifugal pump as an original data, a mathematical model for characteristic conversion of centrifugal pumps is set up. Levenberg-Marquardt method is used to optimize the model and the conversion coefficient of pump efficiency is described as a non-linear function with flowrate, pump discharge head and oil viscosity. On the basis of model, performance automatic conversion system for centrifugal pump is established by program design of computer system. A calculation example shows that this system can shortly and accurately optimize the design or operation scenario for pump sets and realize performance automatic conversion for centrifugal pumps.