A micro fiber Bragg grating（ FBG） strain sensor with two holders in both sides of FBG which are packaged by tube is developed for strain measurement. The sensor structure consists of three parts: FBG

holder tube and tail fibre. The FBG sensors packaged by holder tube has the advantages of small size

variable sensitivity coefficient and high precision

which are applied in laboratory model test which has small strain and dimension restriction. Test results show that micro FBG strain sensor with enhanced sensitivity has the advantages of high sensitivity

low-noise

stable and reliable

it shows a good linear relationship in the range of standard distance

which is over 0. 999. Fabrication process is simple

and it has very high practical value.