Presently, Case Based Learning garners prominence within graduate education for professional degree students. Recognizing drawbacks of traditional teaching strategies during PDS training in traditional Chinese medicine,, a case-based teaching system (CTS) of "Three levels-Five steps-Three excellences method" has been proposed. The three levels of this system is organizational management level, execution level, and feedback level. Three excellences refer to doing excellence, selecting excellence, and collecting excellence. Five steps, including overall planning, case development, teaching application, platform construction, practice and promotion, are used to establish a complete CTS is constructed to enhance students' professional learning experience and improve their ability to integrate theory with practice. The aim of his system is to formulate norms for the compiling of teaching cases and management methods for the construction of case database, establish evaluation mechanisms and standards for teaching cases, use network media and technologies to develop a case sharing platform, and to construct a comprehensive CTS.