The application of optical fiber current transducer in electric power system has been analyzed and summarized deeply. It is pointed out that the birefringence induced by the outside disturbance and temperature change is the main reason of metering errors. Meanwhile

processing difficulty and incompatibility with the current metering and controlling equipment of electric power system are the biggest obstacle for its widespread application. And some new methods to solve the application problems of non functional opticcal fiber current transducer have been proposed.