In order to solve the problems of low power factor and poor ability to resist grid voltage drop of single-phase AC input inverter, and obtain higher reliability, a single-phase AC input Z-source inverter is proposed for high-performance control of permanent magnet synchronous motor drive system under all working conditions. The working principle of ac input Z-source inverter is analyzed. Based on the traditional DC input Z-source inverter, a single-phase AC input Z-source inverter is proposed, the design principle and control method are given, an experimental prototype is built, and a complete experiment is carried out on the system. The experimental results verify the feasibility of the system.