Abstract: The active neutral-point-clamped five-level（ANPC-5L） converter has been widely researched and applied. Compared with the three level converter, it has high rating of output voltage, large power and low current harmonic contents. To take the ANPC-5L inverter as a research object, a space vector pulse width modulation（SVPWM） control algorithm was adopted, by analyzing the single-phase topology of the ANPC-5L inverter and its working principle, the neutral-point voltage of the ANPC-5L inverter was studied. Under different switch states, the region of the balancing neutral-point and the adjusting formula of the neutral-point deflection have been obtained. An effective control method of the neutral-point is proposed, by selecting the switch sequence of the reference voltage vector in the triangle and controlling the reuse vector function of time, a decouple method and a balancing control of the floating capacitor voltage and the neutral-point voltage balance are achieved. Finally the correctness and effectiveness of the control algorithm were verified by experiments.