In order to improve the sensing capacity of the FBG sensing system and the practical engineering viability and the future maintainability of the sensors,a new FBG sensing syste m with bus topological structure based on the optical frequency domain reflectometry (OFDR) technique has been pr oposed in this paper,and in this newly presented sensing system,the sensors multiplexing capacity and spatial re solution of the sensing system can be significantly enhanced by the employment of the OFDR technique.With this t echnique,the FBG sensors with the same wavelength have overcome the limitation brought by the impact of the bandwidth of the light source on the sensing capacity.Compared with the traditional system where the ne tworking is cascaded by FBG with weak reflectivity,this newly proposed system with fiber Bragg grating has st rong reflectivity and the optical branching device is applied so as to achieve bus topological structure for the FBG sensing system which can not only improve the viability of sensor but also overcome the impacts of multiple reflections and spectrum shadow occurring in the cascading FBG sensing network on measuremen t accuracy.The results of the temperature experiment show that the wave length repeatability is ±4pm.