QZ spherical Bridge bearingis compose by top plate, base plate, convex middle plate and two Teflon plates of different composition. Opposite the top plate, it is a concave spherical in the base plate, and the PTFE plate between them. Beam rotation through spherical surfaces and PTFE plate sliding; stainless steel plate on the top plate and another PTFE plates on the intermediate steel plate perform the second sliding surface, realized beam stretching displacement produced by temperature factors.