Abstract: In order to meet the needs of structure health monitoring, the application of quasi-distributed fiber Bragg grating(FBG) sensor in crack monitoring and damage localization was studied in experimental method. By choosing the simply supported reinforced concrete beam and an H-shaped steel beam as the test object, the key location of the beam was divided into several units of multi-point monitoring to obtain the data of the strain. The data was analyzed to achieve the crack monitoring and damage location. The results show that quasi-distributed FBG sensor can accurately locate the occurrence of cracks and damage of the measured area.