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In the grid power system, grid-connected current are easily perturbed by electric gird voltage and other nonlinear factors so that the current waveform deforms. By setting up a model for single grid-connected photovoltaic controller, designing a factional inverter current controller and according to the frequency domain, the relationship between the controller’s portion, integral coefficient, derivative degree and system performance are decided. Under the consideration of the influence by both the integral fractional PI controller, the performance of system under dynamic and static state, anti-interference and grid-connected character are compared in simulate way. And the quality of current waveform for each system is calculated respectively by applying FFT. The result from simulate analysis, fractional control system lower the THD and improve the performance of anti-interference under both dynamic and static state, as well as satisfying other requirements stability index.