This research will investigate the importance order and differences of the factors for the leisure need of the participants swimming across Sun Moon Lake. The result of the research will be provided to the authority as references for designing, arranging the activities in the future. The research method of this study is questionnaire and the objects are the participants swimming across Sun Moon Lake in 2004. The instruments of the research include the leisure need scale and the SPSS statistic soft ware. There are eight items of the sample background data analysis including sex, age, marriage, whether having children or not, the experiences of swimming across Sun Moon Lake, career, education, and monthly income. The delivered questionnaires are 1000 copies and 532 copies are collected; however there are only 387 valid ones. Because of the research purposes need, the valid questionnaires are dealed with by descriptive statistic, factor analysis, independent sample t-test, one-way ANOVA and Scheffe compare afterward. The results are the importance order of the leisure need questionnaire there are ability achievement, body and mind release, knowledge investigation, social interaction. In different tests only knowledge investigation sub-scale are the significant difference in age background and the other sub-scales not.