In order to obtain accurate grounded parameter of distribution network, a method of measuring grounded parameter of power grid based on variable resistor voltage disturbance is put forward. Due to the unbalanced parameters during system normal operation, voltage will deviated in the neutral point for neutral point grounding system and neutral point via arc suppression coil grounded system. By adding resistors with different resistance in the neutral point to change the neutral point’s voltage, this paper measures the voltage amplitude before and after the change, uses the voltage amplitude and other known parameters by certain operations to calculate the distribution network grounded conductance, and substitutes conductance into the equation to obtain accurate grounded capacitance. Matlab simulation analysis and experimental test results show that the method is highly accurate, simple, safe and has wide application and operability. It also points out that appropriate resistance values should be chosen in actual measurement to reduce the measurement error.