This study is designed to develop a set of courses suitable for training online English teachers. It aims at planning training guidelines for online English teachers, strengthening achievement and complementing each other between online English teacher and student, providing online English teaching resources, and offering diversified online English teacher training channels. In this study, ADDIE (Analysis, Design, Development, Implementation and Evaluation) instructional design model was adopted as a reference for conducting research steps. This study encompassed analysis, design, development, and implement phases. Due to time and manpower constraints, this study only explored formative assessment of ¡§Online English Teacher Training Courses¡¨. In this study, 4 participations with online English language teaching experience were interviewed respectively on each section of ¡§Online English Teacher Training Courses¡¨ and completed assessment rating scale. This paper presents three research conclusions of this study in accordance with study purposes, explores the advantages and constraints of online English training courses, and proposes three recommendations for further studies.