The purpose of this study was to investigate the players' social support and participation motivation of elementary school basketball team in Kaohsiung. To explored the relationship between social support and participation motivation and to predict social support in participation motivation. The main research method in this study was a questionnaire survey. The research members were the students who joined Elementary School Basketball League in 2012. Total questionnaire were 605 and the valid questionnaire were 593. The effective response rate was 98%. Using descriptive statistics, single factor multivariate analysis of variance, canonical correlation, stepwise multiple regression to analyze the data. The results are as follows: 1. Basketball players' social support and participation motivation have a positive correlation. 2. Coach support can effectively predict participation motivation.