Abstract: For incorrect single interlocking problem in mine signal concentrating and interlocking system caused by manually setting interlocking conditions, an obtaining method of hostile signal in illegal occupation block was introduced. On the basis of understanding determine conditions of hostile route, two-way link list is used to express route element, so as to generate route list. Then the route list is searched to get the hostile signal. The practical result shows that the method can correctly get hostile signals in illegal occupation block in mine signal concentrating and interlocking system, improve interlocking accuracy and reduce labor intensity.