Traditional voltage quality control devices do not consider the harmonic factors in the regulation， but excessive harmonics may cause great damages in the actual project. An integrated VQC power quality regulating devices with harmonic suppression is proposed， the causes of harmonic amplification and suppression strategies are discussed. Furthermore， a multi-objective optimal control model is designed， considering power quality， reactive power， power losses and harmonics at the same time. Simulation and experimental results prove the effectiveness of the device and the control strategy.