Abstract:DZZ5 new automatic weather station installs a relatively complete lightning protection facility in its construction. But in recent years,it is struck by repeated lightning during the operation. One reason is that the protection level of the equipment lightning is low with weak anti-interference ability and sensitive to the lightning overvoltage. The other reason is that its lightning protection measures in the application ignores the second lightning and ground grids potential equilibrium,including the flanking flashover,touch voltage,step voltage,lightning electromagnetic radiation and other hazards to potential counterattack. The hidden trouble for lightning protection of some new DZZ5 stations is analyzed. Then,the improving methods and measures are put forward,which guide for lightning protection improvement and provide references for the application of lightning protection technology in the new automatic weather station.