Abstract: A new fault location equation is generated. The solution of the generated fault location equation is verified by mathematics. The position relation between fault position and shunt reactor allocation position is identified by the solution of the fault location equation. When the fault position lies on the right of the shunt reactor allocation position, solution of the fault location equation is the real fault distance. When fault position lies on the left of the shunt reactor allocation position, solution of the fault location equation is less than the distance from the right line terminal to the fault position, and more than the distance from the right line terminal to the shunt reactor allocation position. Based on the characteristics of solution for the fault equation, a new fault location algorithm for EHV transmission line with shunt reactor is proposed. The left equality and the right equality of the fault location equation are computed. The norm value of the left equality subtracted by the right equality is computed and the minimum point is searched. The real fault position is searched by analyzing the minimum point based on the characteristics of solution for the fault equation.Results of EMTDC based simulation prove that the proposed algorithm is correct and efficient.