Abstract: With the development of urban power grid, the proportion of cable in 10 kV distribution network is increasing, which highlights the disadvantages of arc suppression coil grounding, and the advantages of small resistance grounding are more and more obvious. This paper introduces the general idea and process of transforming the neutral grounding mode of 10 kV urban distribution network from arc suppression coil to small resistance, and discusses a series of problems existing in the small resistance grounding mode.