The guide rail is a safe rail for the elevator to travel up and down the shaft. The guide rail is installed on the shaft wall and is fixed and connected to the shaft wall by the guide rail frame and the guide rail bracket. The commonly used guide rail of elevator is T-shaped guide rail. It is characterized by strong rigidity, high reliability, safety and low cost. The plane of guide rail must be smooth without obvious uneven surface. Since the guide rail is the shuttle rail of guide shoe and safety gear on elevator car, the clearance must be ensured during installation. At the same time, the guide rail should bear the responsibility of stopping the elevator in case of overspeed accident, so its rigidity can not be ignored. According to the definition of guide rail, guide rail is an important benchmark component of vertical elevator, escalator and escalator. It controls the running track of elevator car, escalator and escalator and ensures the transmission of operation signal. It is also an important part related to elevator safety and operation quality.