For two-stations location system based on the measure of DF and time difference, the locating triangle can be divided into two triangles: the path difference triangle and the equicrural triangle obtained by taking out the path difference triangle. Using the condition that base angle of equicrural triangle is equivalent can obtain the relationship between cut angle and correcting angle. This relationship can use correcting measured path difference and thereby the path difference triangle which is an obtuse angle can be corrected into right-angled triangle. Thereout, the calculation method of cut angle can be solved out whose form is more simple.