Voltage and reactive power compensation are the key to the stable and efficient operation of power system. In order to ensure the long-term stable operation of temporary power supply system, a multi-mode power supply method considering voltage stability and reactive power compensation is proposed. According to the transmission characteristics of stable voltage drive circuit, the compensation controller and reactive power compensation battery are connected to complete the construction of multi-mode power supply environment. The static reactive power compensation generator is designed to compensate the reactive power compensation effect of temporary power supply system and realize dynamic reactive power compensation. The experimental results show that, compared with Ieee-118 transmission control method, the stability of the whole voltage system is obviously improved after the application of multi-mode power supply method, the PID reactive power compensation coefficient is also increasing, and the stable transmission problem of temporary power supply system is effectively solved.