There are many papers researching on series capacitor’s effect on distance protection in recent years, but few papers researching on the area in which the distance protection affected by the series compensation capacitor. This paper firstly analyzes the effect of series compensation capacitor to distance protection, secondly presents a simulation method of defining the area in which the distance protection affected by the series compensation capacitor based on the short circuit current protection. The validity of the simulation method is proved by comparatively analyzing the result of theoretical calculation and simulation calculation. At last, taking a specific engineering as an example, the paper defines the area in which the distance protection affected by the series compensation capacitor by using the simulation.