Abstract: In low voltage urban distribution network, the proportion of buried cables used in distribution lines has reached a high level. Because the capacities between buried cable wires and between the lines to the ground are much larger than those of overhead lines, the buried cable-based power network system has a large charging power (capacitance) when it is under no load and light load, resulting in high voltage at the end of the line, increased power loss and reactive power reversal (i.e. Ferranti effect); At the same time, it is easy to cause system to ground discharge and arc grounding, which brings great hidden danger to the safe operation of distribution network system. In order to weaken the influence of Ferranti effect on the power system when the distribution network in low-voltage urban areas is under light load or no load, this paper explores the methods and equipment to suppress the phenomenon of high voltage at the end of line, increase of power loss and reactive power reversal by analyzing the key factors causing Ferranti effect, and studies and puts forward effective capacitive power suppression strategies.