It is a tensile device mainly composed of slide rails, slide blocks and connecting parts. The slide block can slide freely on the slide rail, and at the same time, the slide block is tightly buckled on the slide rail to resist the pull-out force. In seismic isolation buildings, they are used together with rubber isolation bearings to share the vertical tensile stress generated by the rubber isolation bearings due to earthquakes and improve the anti-overturning performance of isolation buildings.