A comparative analysis is made of the spatial and temporal distribution characteristics of the cloudtoground (CG) lightning data of Fujian Province in 2015 by means of the threedimensional monitoring and ADTD data for the same period. Using the peak values of lightning current, the detection efficiency and location error check in these two systems are conducted, and at the same time, the cumulative probability distribution of lightning current is analyzed in combination with the probability formula of the IEEE standards and the power industry standards. The results show that the distributions of CG lightning density from two lightning location systems are consistent in Fujian. The distribution of CG lightning density from ADTD is higher than that of the threedimensional system in the southwestern Sanming and some areas of Fuzhou. The monthly and hourly changes of CG lightning frequency are the singlepeak type. The frequency of CG lightning strokes from the threedimensional monitoring system is less than that from ADTD from 09:00 to 12:00 in diurnal variation, and from October to December in annual variation. The detection efficiency of the threedimensional monitoring system is 40%, and the average location error of 275 km is estimated. In the range of 0 to 50 kA, compared with the negative cloudtoground lightning, the current amplitudes of positive cloudtoground lightning from the threedimensional monitoring system are distributed more concentrically, and in the range of 26 to 84 kA, the amplitudes of lightning current are higher than the recommended values of IEEE and the related electricity regulations.