Despite the importance of socioemotional competence, few social and emotional learning programs have been developed for and evaluated with non-Western communities. The Early Prevention, Early Identification, and Early Intervention Program is a tiered, school-based program targeting the socioemotional skills of all second-year kindergarten students in Chinese communities with the Little Garden Curriculum and providing additional training to third-year kindergarten students with socioemotional difficulties with the Little Greenhouse Curriculum. Using a cluster randomized controlled trial, this study examined the impacts of the program on 999 children (mean age in the pretest = 4.25 years; 48 % were girls) from 18 kindergartens from Hong Kong, China. Using kindergartens as clusters, children were randomly assigned to undertake the Little Garden Curriculum (n = 624) or join the wait-list control group (n = 375). Furthermore, children who had completed the Little Garden Curriculum but still showed socioemotional difficulties were randomly assigned to undertake the Little Greenhouse Curriculum (n = 87) or join the wait-list control group (n = 50). In other words, the intervention kindergartens used for the evaluation of the Little Garden Curriculum were randomly assigned into a new intervention group or a new wait-list control group for the evaluation of the Little Greenhouse Curriculum. In pre- and posttests, teachers rated children's socioemotional competence and behavioral adjustment, and children completed reading and arithmetic tasks. Results indicated that—controlling for child age, gender, and prior scores—children who had completed the Little Garden Curriculum showed better socioemotional competence, behavioral adjustment, and pre-academic skills (ten out of 12 outcome variables). Moreover, children who had completed the Little Greenhouse Curriculum showed higher scores on six out of 12 outcome measures. Findings highlighted the utility of using culturally relevant programs to improve the socioemotional competence of Chinese children at both the universal and the indicated levels.