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In order to solve the problem of the time delay of frequency characteristic test using frequency response analyzer and Bode diagram of nonlinear EMA system can't be directly obtained by Simulink simulation, correlation measuring method was given to obtain frequency characteristic. Firstly, the principle of correlation measuring method was introduced. Secondly, nonlinear model of EMA was built. At last, simulations and experiments on EMA were carried out using correlation measuring method. The results of simulations show that Bode diagram of nonlinear EMA system can be directly obtained by Simulink simulation. The results of experiments show that bandwidth and resonant peak using correlation measuring method are 31.824 and 1.398 dB, respectively, and bandwidth and resonant peak using Frequency Response Analyzer are 31.818 and 1.402 dB, respectively. The validity of the method is approved through simulations and experiments. It can be concluded that the method greatly reduces the impact of hardware and Frequency Response Analyzer on EMA frequency characteristic.