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针对目前地下工程和道路桥梁领域土压力监测的需求,提出了一种基于拱梁组合体系的光纤光栅压力传感器设计新方法,进行了拱梁组合式光纤光栅压力传感器理论分析,通过降低系梁材料的弹性模量和截面尺寸能够有效增加传感器灵敏度.推导了压力灵敏度系数理论公式,灵敏度系数理论值为1.21×10-3 nm/N.当作用力在0～500 N变化时,拱形结构和铜片协同变形引起光纤光栅波长漂移,试验结果显示:传感器灵敏度系数试验值为1.40×10-3 nm/N,静态误差为2.3％.设计的光纤光栅压力传感器传力机理明确、静态特性稳定,具有良好的工程应用前景.“,”This paper aims to achieve the monitoring of soil pressure.Arch-beam combined FBG pressure sensor is designed,whose model is analyzed in theory.Reducing the elastic modulus and section size of the beam can effectively increase the sensitivity of the sensor.The theoretical value is 1.21 × 10-3 nm/N by the formula of pressure sensitivity coefficient.When the force changes from 0N to 500N,the wavelength shift of FBG sensor caused by arch and copper coordination deformation appears.The test value of sensitivity coefficient is 1.40 × 10-3 nm/N.Static error of the sensor is 2.3％.which shows that the sensor has clear transfer mechanism and stable static characteristics,It has a good prospect of engineering application.