This study constructed a new adventure sports tourism behavior model based on the Robinson (1992) adventure recreation model. This study included some variables, such as the adventure tourism participative motivation, risk cognition and decision making, flow experience, consequent estimation, and perceived positive influences after finishing the activity. The Adventure tourism Scale was used to measure the rafters. The questionnaires were given to rafters in Siaokuluan River, and the non-random sampling method was used. 636 effective questionnaires were collected. Eight hypotheses were tested. LISREL (Linear Structural relationships) was used to test the model. After testing, four results were obtained. First, there was a direct positive effect on risk cognition and decision making for rafting in the rafter participative motivation. Moreover, there was also a direct positive effect on flow experience. Second, there was a direct positive effect on flow experience in rafter risk cognition and decision making for rafting. However, there was no direct positive effect on consequent estimation. Third, there was a direct positive effect on consequent estimation and perceived positive influences in rafter flow experience during rafting and after finishing the activity. Fourth, there was no positive influence between consequent estimation for rafting and perceived positive influences after finishing the activity. Based on these findings, this study not only gave some suggestions for adventure or program managers, but also proposed some future research directions.