Abstract: Introduction In order to improve the transmission capacity of power plants, the series capacitor compensation technology is adopted to reduce transmission line impedance. Method This paper introduced Dafang-Qianxi Power Plant transmission project generally, analyzed the impact of power unit subsynchronous resonance, overvoltage and short circuit current by adopting series capacitor compensation technology. Furthermore, studied the economic comparison of different series capacitor compensation scheme. Result The result shows that the series capacitor compensation scheme with intermediate switching station plus 50% series capacitor compensation is a feasible scheme. Conclusion The final conclusions of the paper can be used as guidance to design the series capacitor compensation transmission scheme for Dafang-Qianxi Power Plant.