The invention provides a method for prediction of performance of a centrifugal pump with a balance mechanism comprising the steps of assuming leakage amounts in a back of an impeller and a thrust balance mechanism to calculate a flow-rate of the impeller for analyzing a leakage amounts of a front and a back of the impeller (steps 2, 3, 4 and 5), calculating a leakage amount in the thrust balance mechanism for judging whether or not a result of the calculation converges (steps 8 and 9), if the result does not converge (step 9), repeating the steps from the analysis of the flow in the thrust balance mechanism (step 7) to the calculation of the leakage amount in the thrust balance mechanism (step 8), if the result converges (step 9), calculating a leakage amount in the pump (step 10), if a result of the calculation does not converge (step 11), repeating the steps from the calculation of the flow-rate in the impeller (step 3) up to the convergence (step 11). IMAGE
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