Electrical equipment fault is one of the reasons that lead to abnormal conditions that continual production enterprises encounter during production. When fault occurs, we need to identify the fault responsibility and locate the position where the fault occurs. The previous matrix algorithm that used for solving fault location is not suitable for this problem. Regarding the practical problem, this paper puts forward an improved matrix algorithm, and improves node definition, corresponding improves network description matrix and fault information matrix, also can get fault judgment matrix from network description matrix and fault information matrix, by fault judgment matrix can get location of the fault occurred. By using this method, one coking enterprise solves the practical problem encountered during production.