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In order to improve lightning disaster risk assessment, two quantification methods of the loss (Lx) in lightning disaster risk assessment standards are proposed. One is based on the quantification of thunderstorm days, and the other on the multiple regression analysis to quantify the loss by means of the lightning location data. The results of the regression analysis show that the 〖WTBX〗F〖WTBZ〗 statistic distribution is highly significant, and 〖WTBX〗 R〖WTBZ〗2 is over 07569 It is concluded that the second method can produce a smaller relative error comparing with the first method; the quantification based on thunderstorm days still has some inadequacies, and the quantification analysis of the loss on the basis of lightning data of Lx is more advantageous. References are provided for refined lightning disaster risk assessment.