In order to eliminate the effects of interphases and interlines coupling as well as parameter uncertainties on fault locations of four-parallel transmission lines on the same tower， a novel phase-mode transformation analysis method for four-parallel transmission lines on the same tower is proposed. Base on this phase-mode transformation method， the circulation mode components are extracted by decoupling the voltage and current information and established the fault location observation equation of four-parallel transmission lines on the same tower in frequency domain. In order to reduce the effects of the multivariate line parameters， the transmission-line-parameter adaptive frequency domain equations are constructed by using the redundant information of the normal voltage and current to obtain the precise transmission line fundamental frequency parameters of circulation components. Based on this approach， a novel parameter adaptive fault location algorithm based on two terminals data of four-parallel transmission lines on the same tower is proposed. Using the ATP-EMTP software， the four-parallel JMarti transmission lines model is constructed for simulation purpose. The simulation results demonstrated that the proposed fault location scheme is capable of eliminating the effects of transmission line coupling and parameter uncertainty. It is also able to achieve high accuracy level in obtaining the fault locations.