In order to monitor the deformation of the space grid structure of high-speed railway station buildings,and to address the problem that the fiber Bragg grating (FBG) is sensitive to both strain and temperature,a biaxial arc h inge FBG inclination sensor,using the titanium alloy TA2which possesses low You ng′s modulus and other superior material properties,is designed at the first ti me in this paper.Based on this design,the oretical analysis,finite element simulation as well as sensor performance tests are carried out respectively.At the meantime result comparison and error analysi s are also presented comprehensively. The sensor′s sensitive structure is a biaxial arc hinge.The pre-stretched FBG is attached to the fiber guide grooves of the upper and lower bases connected to the arc hinge to realize two-directional monitoring of the object′s tilt angle.Experimental res ults show that the sensitivity of the biaxialarc hinge FBG inclination sensor is 168.43p m/deg,the effective moni toring range is ±15°,and the linear correlation within the monitoring range c an reach 0.9999.At the same time,the temperature effect is el iminated successfully,which i s suitable for large temperature changes and high accuracy requirements,especia lly for deformation monitoring of the space grid structure of high-speed ra ilway station buildings.