A new design of FBG tilt sensor was presented in this paper which structure is simple and stable,and its accuracy was relatively high.The tilt sensor structure consists of four fiber grating hanging the weight on the round plate,four-fiber bonding points with uniform distribution of the round plate on the round plate edge,the other end of the fiber grating hangs the weight,so that the force induced in the each fiber grating uniformly.When the platform is tilted,the force induced in the each fiber grating ch...