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An optimized iterative algorithm for generalized phase-shifting interferometry is proposed. Using 1/4 plate as phase-shifter, we derive the phase distribution with the initial phase shift of π/2, then a more accurate phase shift can be obtained with the obtained phase distribution. The whole iteration includes the above two steps. The exact phase shift is near π/2, so fewer iterative steps are needed. And this method doesn't have the limitation that iterative time is apt to be influenced by iterative step length. Therefore, our algorithm improves the efficiency as well as the accuracy. Computer simulation and optical experiment verified the feasibility and superiority of this algorithm.