The goal of current study was to investigate the effects of learning interest, self-efficacy, and perceived parent and teacher supports on students’ continuing motivation for science, technology, engineering, art, and mathematics(STEAM) education. A total of 7426 students were adopted from the 2015 Program for International Student Assessment B-S-J-G(Beijing, Shanghai, Jiangsu,and Guangdong) samples. The results showed that: 1) Both perceived parent support and teacher support significantly predicted students’ learning interest and self-efficacy; in addition, perceived teacher support also significantly predicted students’ STEAM continuing motivation. 2) Students’ learning interest and self-efficacy had significant positive effects on students’ STEAM continuing motivation. 3) Learning interest and self-efficacy played complete mediating roles between perceived parent support and STEAM continuing motivation while playing partial mediating roles between perceived teacher support and STEAM continuing motivation.