Abstract: Abstract: In the power distribution system, the imbalance between reactive power supply and demand is an important factor causing voltage fluctuations and uneven distribution. Capacitor banks, as commonly used reactive power compensation devices in substations, have a direct impact on the voltage state of the power grid when they are put into operation. Select typical distribution systems, construct reactive power compensation analysis models for capacitor banks, set multiple operating conditions under different load levels and compensation methods, and conduct comparative analysis on the voltage distribution characteristics of the power grid. The results show that the input of capacitor banks can effectively increase the system voltage level and improve the uniformity of voltage distribution between nodes. Its effect is more obvious under high load conditions, which can provide a reference for the operation configuration of capacitor banks.