In this study, we investigate the college basketball player of social support, School Adaptation for the impact of participation motivation. The subjects participating in 103 league players in college basketball for the study, a total of 600 questionnaires distributed, 520 questionnaires were recovered, excluding 65 invalid questionnaires, got 455 valid questionnaires, the official response rate 75.83 %. Statistical analysis included Descriptive Statistics, Projects Analysis, Reliability and Validity analysis, Partial Least Squares. The statistical data analysis showed the model fit is good. The results found: (1) College basketball player of "Social Support" will positively affect the "School Adaptation" and "Participation Motivation". (2) " School Adaptation "is also a positive effect," Participation Motivation". (3) " Social Support "through" School Adaptation "indirect impact on the college basketball player of" Participation Motivation."