The principle of Mach-Zehnder（M-Z）interferometer is introduced and the nature of magnetostrictive material is analyzed.A method is proposed that pastes fiber on the square magnetostrictive material formation orthogonal structure which constitutes a symmetrical type of arms M-Z interferometer.This makes fiber-optic current sensor based on the magnetostrictive material have temperature compensation.It can eliminate the effects of thermal expansion of the magnetostrictive material.Then the design of the sensor is completed.In the experiment

the measurement error of sensing head is 0.8% when the environment temperature changes from 5

6

5℃.It shows that the structure can achieve the effect of temperature compensation