The main purpose of the study was to investigate the relationships between the recreational sports participation, family support and the happiness among senior citizens in Taoyuan city. 800 questionnaires were distributed and 426 valid questionnaires were collected for statistical analysis. The findings are as followed: 1. The relationship between the family support and the seniors' recreational sports participation was in the low negative correlation. 2. When the family in low support but the high participation in sports, the relationship between the seniors' recreational sport participation and the happiness was also in the low negative correlation. 3. The happiness and the family support were in a highly positive relationship. Apparently, family support is able to effectively predict the happiness of the seniors. Therefore, we recommend that the family has to support the seniors.