Abstract:The “key minority” is essential for the central authority to permeate into grassroots communities. Strengthening leadership over the “key minority” has become an important strategy for the Communist Party of China to govern the country in the new era. In representative democracy, the “key minority” are political elites who hold public power and take public responsibility. According to principal-agent theory, the “key minority” as political agents must act on behalf of the political principal (the people) in the execution of public power. However, in the principal-agent relationship in political life, political agents as the “key minority” have information advantages, and thus may act against public will for their own interests in the execution of public power. First, the “key minority”, under the influence of the thoughts such as the “official-oriented consciousness”, are rigid and dogmatic, resulting in infinite diminishing of discretion and sloth administration. Second, the “key minority” as administrators and organizers are conceited and seriously divorced from the people. Third, the “key minority” are corrupt abusing their power to maximize their economic interest. To exercise more supervision and leadership over the “key minority” and prevent political risks, firstly we should realize effective supervision over the “key minority”. Secondly, we should realize effective communication and interaction between the “key minority” and the public. Thirdly, we should realize effective control over the “key minority”.