The purpose of this study is to understand the implementation of integrated children's English into classroom curriculum in a preschool. The subject of this study is based on a bilingual class of a preschool in North Taiwan, consisting 20 preschoolers, 1 English teacher, and 1 Chinese teacher. The researchers adopt the qualitative approach, using long-term observation, interview, and documents collection, in order to understand what is going on in the bilingual class. At last, the researchers also provide a discussion and some recommendations for future early childhood English teaching.