At present，the main problems existed in the distribution network are weak network frame，unreasonable network structure，small cross sectional area of conductor，large power supply radius，fast increase of number of distribution transformer and of load of high power motor as well as low load power，leading serious voltage sag，high line loss，low power factor，small transmission capacity and frequent voltage flicker of the distribution line. For this purpose，the working principle，main composition，selection of installation position and capacitive reactance of 10 kV series capacitor compensation are introduced in this paper. Then，the equivalent model of the asynchronous motor is introduced. Finally，the influence of series compensation capacitors on the starting of asynchronous motor at such situations as different installation positions，magnitude of capacitive reactance and shunt resistance of series compensation capacitors is analyzed through Matlab simulation，which provides useful references for the design and engineering practice of series capacitor compensation devices.