With the rapid advancement of artificial intelligence and its integration into education, the potential for enhancing English-speaking instruction has grown significantly. Traditional methods of teaching speaking to English-majored students often face challenges such as time constraints, limited access to native speakers, and varying levels of student proficiency. This study explores the auxiliary role of ChatGPT, a large language model, in assisting the development of speaking skills among English majors. By leveraging its natural language processing capabilities, the study aims to innovate teaching methods and provide learners with personalized, real-time practice opportunities. The article first outlines the technical features of ChatGPT and its applications in speaking instruction, including customized conversation practice, real-time interaction, and intelligent feedback. It also examines the current challenges of traditional speaking instruction, such as limited classroom time and the need for individualized feedback. Furthermore, the study discusses how ChatGPT can support teachers in providing scalable, interactive learning experiences. Finally, the article evaluates the effectiveness and feasibility of ChatGPT in enhancing speaking proficiency and highlights the potential future applications of AI tools in English language education. This research offers valuable insights into how AI can be integrated into language learning to address existing challenges and improve the overall teaching of speaking skills.