This study aims to delve into the impact of utilizing ChatGPT and other AI tools on the discourse writing performance of English major students, as well as to explore their potential value and future prospects in the field of English education. With the continuous development and application of artificial intelligence technology, AI tools have gradually demonstrated their unique advantages and potential in language learning and writing instruction. However, for English major students, how to effectively utilize these technological tools to enhance their discourse writing abilities remains a subject of considerable interest. In the field of language learning, AI technology has made significant strides in vocabulary acquisition, grammar correction, and discourse generation. ChatGPT, as a natural language generation model, possesses strong language comprehension and generation capabilities and is widely used in dialogue generation, text generation, and other areas. In English education, ChatGPT can provide personalized writing guidance and feedback to students, helping them clarify their thoughts and improve their expression skills. Additionally, other AI tools such as speech recognition technology and text-to-speech technology offer more possibilities for students' English learning and writing. However, despite the numerous advantages demonstrated by AI tools in discourse writing instruction for English major students, their application also faces challenges and limitations. For instance, AI tools still have limitations in understanding academic language and specialized terminology, and they cannot fully replace human professional judgment and language application abilities. Furthermore, the widespread adoption and use of AI tools require addressing technical challenges and adaptation issues in teaching practice to ensure their effective application in education. In conclusion, this study will comprehensively explore the actual effects and potential value of AI tools in discourse writing instruction for English major students through a combination of literature review and empirical research methods, providing new insights and guidance for teaching practice and future research endeavors.