This study explores the feasibility and effectiveness of using ChatGPT for providing feedback on junior high school English writing in Chinese EFL context. While existing research on AI in education mainly focuses on correcting writing, little is known about ChatGPT’s practicality and students’ attitudes towards it. Through empirical analysis of feedback on content, organization, language, grammar, and comparison forms, the study found that ChatGPT significantly improved feedback quality and expanded metalinguistic resources. Over 76% of students adapted to ChatGPT, with more than 70% reporting improved writing, and nearly 66% preferring combined AI and teacher feedback. These findings highlight strong student acceptance and suggest that integrating ChatGPT with human feedback offers promising directions for enhancing second language writing instruction.