Abstract: Combining photovoltaic grid system and active power filter,a new system is proposed,which can realize grid-connected power generation and reactive compensation and filter harmonic current.A dead-beat control strategy applying to the system is put forward,the principle of strategy and calculation method of composite instructions are given as well.Finally,simulation model and experimental platform are built,demonstrating the implementations of the system.Operation data shows that the structure and control strategy of the system’s validity and rationality.