In this paper,fourth-order L-moments method was used in choosing best design storm frequency distribution and its suitability was also analyzed through the comparison with other four methods for the selection of best distribution.The results show that the fourth-order L-moments method is significant if the LN3(three-parameter lognormal) distribution is used as for the study area,this result is same as other four methods.The fourth-order L-moments is a good method in choosing design storm frequency distribut...