To obtain better control effect of large capacity hybrid active power filter（HHAPF）， the topology and work principle of HHAPF are studied， and the control model equation of HHAPF established. Based on the control strategy of load harmonic current controlling inverter output voltage， the impacts of system parameter changes on the control characteristics of HHAPF， such as changes of load harmonic current， busbar harmonic voltage， system impedance and system frequency， are analyzed. The investigated conclusions are able to help guide the safe and efficient operation of HHAPF under complex statuses.