In order to solve the unsatisfactory section location problem of single phase grounding fault in distribution network， a novel method of fault section location based on phase current increment is presented according to the similarities between features of threephase phase current increment waveform in healthy lines and the fault line after the fault point, as well as great difference between healthy lines and the fault line before the fault point. In the method, the power coefficients of each detection point can be calculated by threephase current increment and sent back to host. The fault section is predicted by comparison with the power coefficients of its adjacent detection points. The advantage of this method is that it reduces the pressure of the communication system while only using current as the fault section location characteristic. Furthermore, simulation and data analysis indicate that this method can correctly predict fault section in high, medium and low resistance grounding under every kind of initial angles. It has good applicability under simple theory.