In response to the needs for kindergarten principals to foster teachers' capacities and commitment, this study examined the relationships between professional learning communities, principal leadership practices, and teacher commitment to kindergartens among 2106 teachers from 153 Hong Kong kindergartens, analyzing by using multilevel structural equation modeling. The result showed that principal leadership practices facilitated the development of professional learning communities at school and teacher levels, and exerted a direct effect on teacher commitment at the teacher level. However, the mediating effects of different professional-learning-community components were found distinctive. Implications for leading kindergartens in the reform time are discussed.