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This paper proposed a new algorithm for High Impedance Fault (HIF) detection using Phasor Measurement Unit (PMU). This type of faults is difficult to detect by over current protection relays because of low fault current. In this paper a new method based on PMU is proposed which is sensitive to the change of current phasor. The phasors are measured PMU to obtain the square summation of errors. Two types of data are used for error calculation. The first one is sampled data and the second one is estimated data. The estimated data is obtained by phasors which explained in paper in detail. The verification of the proposed method is done by EMTP.