Distribution network fault location mainly depends on the dual-end traveling wave and dual-end impedance methods. Line commutation may cause the voltage and current phase sequence collected by the terminals on both sides of the fault point to not correspond to each other. This leads to untrustworthy results in distance measurement. Therefore, an adaptive phase sequence identification method is urgently needed to solve the problem of dual-end electrical quantity mismatch. Given synchronous sampling of distribution terminals, and using the characteristic that distributed load along the line has little influence on system voltage and current, the changes of collection of electrical quantity and fault information by adjacent distribution terminals caused by different commutation times of two commutation modes are analyzed. An adaptive phase sequence identification method is presented. This method calculates the similarity coefficient of collection electrical quantity by adjacent distribution terminals and phase angle difference, and records the corresponding relation of action or alarm information of the same fault. It also judges how and how many times the lines in the protection area commutate, and realizes phase sequence recognition. By judging the phase advance relationship of electric quantity collected by the distribution terminal, automatic identification of mutual inductor reverse connection can be achieved without additional devices or manual configuration. The simulation results show that this method can effectively identify the voltage and current phase sequence relationship between arbitary adjacent terminals with high accuracy. This provides a guarantee for the application of the double-ended ranging method in engineering. This work is supported by the National Natural Science Foundation of China (No. 52077221).