When the strain and deformation of the structure were measured,the three methods,the traditional resis⁃tive strain gauge,fiber bragg grating(FBG)and brillouin optical time domain reflection(BOTDR)have different prin⁃ciples. Based on these three monitoring technology,a bend test of simply supported beam was designed,then the strain and the deflection of the simply supported beam were gained. Through comparing the calculation and the mea⁃surement deflection,the accuracy and sensitivity of the three kinds of monitoring technology in the strain and deflec⁃tion test were analyzed. At the same time,the characteristics of these two kinds of optical fiber sensing technology were evaluated. It provides reference basis for choosing better methods in the civil engineering monitoring ,and it worth of researchment and development for the new strain sensor and monitor.%在测量结构应变和变形时，传统的电阻应变片测试技术和新型的光栅布拉格光纤传感技术（FBG）、布里渊光时域反射技术（BOTDR）三者均具有不同的监测原理。设计并进行了基于这三种监测技术的简支梁弯曲试验，测试结构应变，对比结构挠曲变形，分析了三种监测技术在应变测量中的精度、灵敏度、布设工艺和适用性等，评价了两种光纤传感技术用于结构挠曲变形测试的特性。为选择土木工程结构监测手段提供参考依据，对进一步研究、开发新型应变传感器和监测仪具有参考价值。
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