Abstract: In order to improve the speed of fault handling and the power supply reliability, some domestic low-resistance grounding distribution networks have piloted to use the longitudinal differential protection technology to deal with the grounding faults. However, the zero sequence overcurrent protection strategy can not deal with high resistance grounding faults effectively. This paper analyzes the characteristics of single phase grounding faults in the low-resistance grounding system considering the line impedance. By using the proportional relationship between zero sequence voltage and zero sequence current, it then proposes a longitudinal differential protection scheme for grounding faults with amended zero sequence voltage amplitude. In this scheme, the zero sequence voltage information is used to adaptively correct the current between the two terminals. Meanwhile, considering the limiting factors, for example, there are fewer terminals or the zero sequence voltage drops greatly under extreme conditions, the setting value will be increased to avoid the upstream terminals mal-operation. It is verified by simulation and experiment data that the longitudinal differential protection is able to deal with more than 1000Ω grounding faults.