An interleaved parallel flyback grid-connected micro inverter was focused on, and its grid-connected operation principle and control strategy were presented; what is more, the key techniques were also discussed in the paper. In photovoltaic (PV)grid-connected micro-inverter system, the tracking control is the core and key technology of the system, and directly affects the output power quality and system efficiency. The direct current control has been chosen to synchronize the current frequency and phase with the grid. The Mathematical model of main power circuit is made and the small-signal control model is deduced. Then, current loop control parameters are designed and presented, and finally the simulation and experimental results verify the feasibility of the control strategy.