With the development of smart grid and new technology

optical fiber current transducer is the research direction of new current transducer because of its good anti-interference and safety. At present

the main problem is that the reliability and stability of long-term work need to be further improved. Consequently

the reflective all-fiber current transducer is selected as the research object

and its error source is analyzed in detail. The error calculation model is established based on the Jones matrix

and the influence of scale factor is compared and analyzed. The results show that the process errors such as linear birefringence

1/4 wave plate

and 45° fusion error have a great influence on the scale factor. When comprehensive errors act together

the influence of scale factor（s） fluctuates within 0.5%. Based on error analysis

reference compensation schemes such as improving process accuracy

introducing twisted optical fiber and signal processing can better improve the measurement deviation.