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The fault information of power system often has the problems of missing information, malfunction and failure to operation, in order to solve the problems and improve the diagnosis ability, a new method based on probability-box theory and support vector machine was proposed. Firstly, the data of fault record and electrical quantities were used as the information source to construct the p-box. Then to take advantage of the complementation of the information source, the different p-box were fused and extract the feature from the p-boxes. Finally, using SVM classification and obtain the result. In order to verify the validity of the method, the simulation circuit is adopted to improve the probability box of fault diagnosis, the experimental shows that the p-box theory has high degree of diagnosis accuracy and is characterized by fast diagnosis and good real-time.