With the increasing globalisation and the integration of blended learning models, academic English writing has become a critical skill introduced at the high school level. This study investigates how Chinese international high school students develop and apply effective English language learning strategies to address the specific challenges of academic English writing in a blended learning environment that combines offline EFL (English as a Foreign Language) and online ESL (English as a Second Language) instruction. Utilising a qualitative research design, three participants in this special blended learning environment are selected as specific cases. Data were collected through semi-structured interviews, student learning logs, and classroom observations. Findings reveal that students employ a combination of cognitive, metacognitive, and social strategies to address issues in this special blended learning environment. The study underscores the importance of integrating technology with traditional teaching methods, highlighting the effectiveness of blended learning in supporting students' academic writing. These insights offer valuable guidance for educators in enhancing teaching practices and for policymakers in designing supportive educational frameworks.