In order to achieve real-time temperature monitoring function in a wide range measured area

fiber Bragg grating（ FBG） temperature measurement network is selected. Meanwhile

in order to improve precision of temperature measurement and anti-jamming capability

FBG temperature measurement network system based on differential correction is designed. Based on original structure of the test system

correction fiber-optic probe is added

so that the temperature error from individual environmental change can be corrected for any position.Through theoretical analysis

the expression of difference correction values is given

and the differential correction algorithm is designe

d. Temperature control box is used in experiments

so that the temperature of measured region can be changed from 20

80 ℃

and its the minimum value of temperature change is 1. 0 ℃. Experimental results show that approximately every 1. 0 ℃ temperature change generate 35

45 pm offset between offset values generated by echo center wavelengths and temperature. In the differential correction type temperature measurement system

temperature measurement error is 0. 47 %

prior to traditional measurement system. It is little affected by the local environment in the differential correction type temperature measurement system

so it has high system stability.