Abstract: The capacitive current of long cable line can cause a bigger loss of power,a lower power factor and the disconnecting switch cann’t cut and close the unloaded line and so on. On the basis of power flow method for cable line, we get the conclusiont that the reason for these problems is the excessive capacitive reactive power that produced by the excessive capacitive current of unloaded or light-loaded cable. when the capacitive current of unload line exceed 5A, the method to limite the capacitive current by shunt reactor that installed on line side of circuit breaker. when the capacitive current of unload line less than 5A ,but the capacitive reactive power transmit to power system when the line run in light-load, the method to limite capacitive current by shunt reactor that installed on high voltage bus or SVG that installed on Transformer Low Voltage Side.w to use the shunt reactor or SVG to limite the capacitive current.