During the two decades of reign, Minh Mang King left the history of valuable political, economic, cultural and military heritage. One of the factors that helped Minh Mang to succeed was that he built a system of virtuous and diligent officials. In the process of building the administrative apparatus and enforcing the policy of recruiting officials, Minh Mang King set three important dog targets. First, fair and indistinguishable from royalty or people. Secondly, mandarins must undergo new training to be successful and through selection to supplement their abilities and strengths. Thirdly, put the responsibility for the incumbent officials to appoint talented people to consult and help the king of humanity. For 20 years of reign, Minh Mang King had methods to select the virtues and diligence to help the king and take care of the people.