Studies on monolingual children have shown that home language and literacy support is crucial in children's early literacy acquisition. However, such support has not been examined as thoroughly among bilingual children, including heritage speakers. This study investigated the effect of home language and literacy support on important precursors of literacy skills including oral vocabulary knowledge, phonological awareness, and decoding skill in English and Chinese, among a group of 37 Chinese heritage language (CHL) learners. Our results suggest that the use of Chinese at home supported children's language and literacy skills in Chinese, especially their oral vocabulary knowledge; support of learning Chinese at home did not hinder children's acquisition of literacy skills in English. Implications for parents and teachers of CHL learners in relation to their biliteracy learning are discussed. (Contains 7 tables and 1 note.)