The output voltage amplitude of traditional multiphase inverter is always lower than the input side. When in a heavy load, higher DC-link voltage is needed, which will enlarge the volume of the filter capacitor and increase the cost. In the traditional control of multiphase inverter, the complexity of setting dead zones affects the quality of the output waveforms. For these drawbacks, the quasi Z-source network is introduced to the six-leg voltage-source inverter (QZS-SL-VSI) and an improved modulation strategy with shoot-through control is presented on the basis of the SVPWM for the traditional six-leg inverter. First, the boost operating principles are analyzed in detail. Then, the distribution of the voltage vectors of quasi Z-source six-leg inverter is analyzed. On this basis, the dual voltage space vector modulation strategy with shoot-through control and two switch modes based on the distribution working time of the shoot-through zero vector is expounded. Finally, Matlab/Simulink simulation is conducted, and a prototype machine is designed to experimental verification. Through analyzing simulative and experimental waveform, the feasibility and validity of the QZS-SL-VSI and new strategy are well verified. This work is supported by National Natural Science Foundation of China (No. 51277156 and No. 51307148) and Foundation of China Scholar Council (No. 201608430006).