The duty of loyalty of civil servant is an important question when discussing the management of civil servant. There are law-made about the duty of loyalty of civil servants in many countries. A series of theories have been constructed about this topic. On the condition of “one country, two systems”, it is different of the duty of loyalty of civil servant between Chinese Mainland and MSAR. But it is the common duty for all Chinese and Macao’s civil servants to be loyalty the basic interest of Chinese People.