Abstract: The wiring form of typical grounding mode and composite grounding arc-suppression mode of distribution network neutral point are discussed. Centering on analysis of single-phase ground fault, and based on a wide-range survey of typical structure and accessing equipment of 10 kV distribution network, accurate simulation model reflecting engineering practice is established according to the existing power design standards. This paper not only describes the principle of grounding fault transfer mode and intelligent multimode grounding mode respectively, but also analyzes their fault treatment process by simulation. In addition, a line selection method based on the first transient half wave of fault grounding and operation grounding of the own line is put forward for grounding fault transfer mode, and the effect of transition resistance on zero-sequence current protection for intelligent multimode grounding mode is analyzed. This research lays a solid theoretical foundation for the engineering application of composite grounding arc-suppression mode.