The concept of Habitual Domains (HD) was first introduced by professor Po-Lung Yu, who was the C. A Scupin Distinguished Professor at the University of Kansas in the U.S. He is now a Distinguished professor at NCTU in Taiwan. Having studied the relations between the human being’s mind, behavior and decision making for a long time, he finds that HD exists both in the individual and the groups. HD shows immense influence not only on one’s feeling, thinking, decision making and action, but also on the success of an industry, a political party, and a nation. So he believes that improving good habitual domains is much important than good fortune. He states that it is difficult for a firm to succeed without having a good HD. Without a bad HD, it is difficult for a firm to fail. (Po-Lung Yu, 1998: 46) Yu advocates the teaching of HD. He hopes that everyone can be successful, wise, and happy, though one’s continuing developing good HD. Just as the old saying, old habits die hard. Some Chinese believe that one’s character determines one’s destiny, and that one’s habits define one’s life. The habits of a man has definite influences on one’s life is not a new finding. But HD Theory surely is not a collection of old sayings. HD theory is critical and dialectic. It teaches one not only to be successful but also to be wise. In addition, Professor Yu shows high respect for the subjectivity of human being, which makes HD theory more humane and unique. HD theory concerns both the developments of the individuals and the improvements of the societies. Both refer to education. This article aims to study: (1). What is the definition of Habitual Domains? (2). What are the characteristics of Habitual Domains? (3). How to put Habitual Domains Theory into practice in education? This study finds that the characteristics of Habitual Domains are: co-existent, general, hidden, systematic and changeable. HD Theory can be utilized in the practice of existential phenomenology and multiple intelligence. A model of “five stages and two cycles” is recommended. The author suggests HD Theory should be applied to the education system in Taiwan.