Abstract: In recent years, due to the advantages of improved control dimensions and high reliability, the multiphase machines have attracted wide attention in high-reliability applications. Undisturbed operation through control algorithm without changing the hardware circuit in the case of phase failure is the fast-growing research hotspots for domestic and foreign scholars. This paper analyzed fault-tolerant control of multi-phase machines which has been carried out in this field during the past 20 years. The main fault-tolerant control algorithms were classified into two major types, namely keeping the torque ripple minimum and keeping the magnetic motive force unchanged. The typical control strategies and key technologies of each method were analyzed. The advantages and disadvantages of each method were investigated. Furthermore, the research states of each method were conducted. Then, the fault-tolerant control of multiphase generator was introduced briefly. Finally, the fault-tolerant control technology of multiphase machine was summarized and prospected.