光纤布拉格光栅在非均匀应力场作用下，其纤芯折射率及光栅栅距都将产生非均匀变化。本文给出了光纤光栅与非均匀应变场的相互作用模型，建立了反射谱对非均匀应变的响应关系，并给出了线性应力场的实验结果。 Fiber Bragg gratings under non-uniform stress field, the core refractive index and grating pitch will produce non-uniform changes. In this paper, the model of the interaction between fiber grating and non-uniform strain field is given, and the response of the reflection spectrum to the non-uniform strain is established. The experimental results of the linear stress field are also given.