Abstract: The modular multilevel converter-based high voltage direct current（MMC-HVDC）systems for large-scale renewable energy integration can change the small-signal voltage stability mechanism of the system. Therefore,this paper studies the small-signal voltage stability mechanism of MMC-HVDC systems with induction motor loads. The linearized state-space model of the system is developed,and key factors that affect the small-signal voltage stability are studied. According to the eigenvalue and participation factor analysis,reducing the proportional gains of the MMC controller and the electrical distance between MMC and induction motors can both threaten the small-signal voltage stability. However,increasing the electrical distance between MMC and induction motors can lead to the missing of stable equilibrium points. The electromagnetic transient simulation model based on PSCAD/EMTDC verifies the accuracy of the small-signal model and the effectiveness of the conclusions.