For a very long time, there is one of focuses discussion of constitutional development process that how to identify discharging the chief of state's duties role in Taiwan. Obviously, the president to be a chief of state, he always does any political action according to constitutional rights and obligations. For this reason, the president is not only the circus of leading operation of totally government system, but also a key point of political stability. Nevertheless, during the process of six constitutional reforms, until now there are so many debates about how to identify discharging the chief of state's duties role. After comparing to the characteristic of government system of Britain, America and French, about this topic that there is maybe not perfect of the constitutional norm in Taiwan, but it still worthy of learning to modify.