Construction-Agent System" (CAS) is a significant measure of deepening the reform of governmental investment systems and facilitating the transformation of governmental functions. In this paper, we are devoted to identifying 203 governance activities of a CAS project in multi-case studies to answer the following two key questions within a Chinese context: (1) What are the attributes and features of a CAS project governance activities? and (2) How can the governance structure of a CAS project be classified in consideration of the nature of project governance? This study has proposed a method to categorize governance structures of CAS projects. Our results show that CAS projects can be split into weak, median and strong governance structures, with the structures demonstrating an increase in governance links and subjects from the weak to the strong types. Then, the study defines the meanings and extensions of every governance type, placing emphasis on the key governance links and subjects according to the governance intensity and structure required by the project. In this way, the efficiency of CAS projects will be improved.