For grid-connected inverter with LCL filter which uses active damping control strategy，the grid-connected inverter with current feedback LCL filter is able to operate stably.Its inverter-side parameter is relatively stronger and its control parameter design is relatively more simple.However，the grid current contains a lot of low-order harmonic current.The reason for producing low-order harmonic current is analyzed from the aspect of control so as to obtain the effect of suppression on low-order harmonic current from LCL filter parameters and control parameters of current loop.The design method for LCL filter and control parameters is derived based on results of above analyses.The experimental results verify that the proposed method for parameter design is accurate and valid.