Despite the inverter interfaced distributed generator's capability of compensating for the harmonic current when outputting fundamental power，interaction takes place if compensation is made independently by multiple inverter interfaced distributed generators at the same time.A study is made of the interaction between two independent inverter interfaced generators using the relative gain array method，and a coordinated microgrid harmonic control method based on multiple inverter interfaced distributed generators is proposed.First，a bus is selected as the target bus of harmonic control in the microgrid.Secondly，the detected harmonic voltage phasor of the target bus is decomposed.Then the coordinated control for the multiple inverter interfaced distributed generators is achieved by allocating the compensation quantity.Simulation results show that the proposed method is able to effectively realize harmonic suppression in the microgrid by coordinating multiple inverter interfaced generators.