Lightning density and lightning current amplitude are two important parameters in lightning protection.In this article,time-weighted average method is introduced to combine data recorded by conventional method and lightning location system (LLS),Matlab is employed to realize the fitting of lightning current amplitude according to Anderson empirical formula.Results show that in Jiangsu province lightning activities occurred more in the southern regions than northern regions,more in the western regions than eastern regions.Lightning protection should be an important task particularly in regions surrounding Hongze Lake,Taihu Lake and Ningzhen hills; probability distribution of lightning current amplitude fits with Anderson experimental formula,and amplitude mainly distributed in the range from 20 kA to 40 kA.