Abstract: Based on Guanlan Station of Shenzhen Metro Line 4 Phase Ⅲ Project, the application on surface strain gauges of fiber bragg grating (FBG) in the automatic monitoring of internal forces of supports was introduced for the deep excavation, including the detailed installation process of surface strain gauges of FBG and the calculation method of internal force of support. The monitoring data on field was analyzed to provide technical supports for the popularization and application.