In order to meet the pressure measurement needs of oil and gas pipelin es, this paper presents and studies a fiber Bragg grating (FBG) pressure sensor which uses a di aphragm and a L-shaped cantilever as a sensing unit. According to the structure model of the pressure sensor, the se nsor sensitivity and temperature compensation effect are analyzed by theoretical calculation,the static and dynamic characteristics of the sensor are analyzed by finite element method. Exp erimental results show that the sensitivity of the sensor is 1185.621pm/MPa,an d the correlation coefficient reaches 0.99983in the pressure range of 0－2MPa. Furtherm ore,the correlation coefficient reaches above 0.999in the temperature range of 0－80℃,and the sensor can effectively eliminate the temperature cross-sensitivity. And with good reliabil ity,this FBG pressure sensor can be widely used in the quasi-distributed long-term online monitoring of the pressu re of oil and gas pipelines.