Abstract: A kind of wall type lead alloy damping device with gear transmission was proposed in this paper, to solve the problem that the shear type steel plate damper cannot meet the requirement of large travel, and the accumulated damage needs to be replaced after the earthquake. The working principle was explained and the construction scheme was suggested. Mechanical test and numerical simulation analysis were used for studying on the seismic performance of the wall type lead alloy damping device with gear transmission. Results indicate that the damping device can meet the demand of large stroke by using the recrystallization property of lead alloy at room temperature and the construction form of gear transmission. The damper has stable hysteretic performance and high energy dissipation capacity, whereas has no obvious fatigue damage effect and no need to be replaced. The numerical simulation of a practical thermal power plant shows that the gear transmission wall-type lead alloy damping device can effectively improve the seismic performance of the whole structure and reduce the seismic response.