The ways of thunder and light destroying seismostations are summarized.There was a light rod at Changping station,but it did not work well in protecting the station from thunder and light.The principle and advantages of a new device against thunder-bolt with capacity earth connection is introduced.The devices were installed at 42 stations in Beijing City and Fujian,Zhejiang,Sichuan,Liaoning,Guangxi,Guangdong,Hainan,Shaanxi,Hebei Provinces.Facts have proved that the devices are satisfactory.