This book adopts a tripartite framework approach to explore the identity construction of early-career researchers in applied linguistics. This tripartite framework of identity-in-practice, identity-in-discourse, and identity-in-activity enables a comprehensive understanding of the complexities involved in the process, within the context of China's higher education context. By delving into the complexities of early-career teachers' professional development and identity construction in China's evolving higher education landscape, readers gain a deeper understanding of the challenges and opportunities faced by these professionals. This knowledge informs educators and administrators in providing effective support for the professional development of early-career teachers, as well as offers insights that may be applicable to teachers and researchers in other contexts. Furthermore, the tripartite framework of teacher identity based on the findings lends support to an expanded notion of professional development that higher education teachers should draw on to empower themselves.