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In order to reduce the fiber optic cable and shortening the time of cable network fault diagnosis, failure rate is put forward based on the optical power test of fiber optic fault monitoring method and optical time domain reflectometer. Using the optical power measurement technology on fiber optic cable performance real-time monitoring and early warning cable fault; Analysis of the causes involved in power attenuation of optical fiber, the length of the cable repair is calculated to increase, design the correction of fault location algorithms; Failure occurs when the cable network, using the optical time domain reflectometer test fault location, and use the analysis of cable attenuation rule out error detection algorithm, fault location correction to fault location for quick repair. Results show that the method can reduce the cable network, the failure rate in the fault location can improve the precision of fiber optic cable fault location, fault location of the calculation and the actual fault location error is not more than 10 m, real-time fast repair, can run for a considerable time cable network effect is more obvious, has good application value.