“The Principal” is the image, the chief, and the core of a school. Every move of him or her affects everyone and everything in the school. A professional principal can direct a school forward, create new perspectives and generate humane and harmonic atmosphere. Thus, the profession of a principal cannot be ignored. This study is, mainly on the of Foucault’s thought of governmentality, how a new principal becomes professional and then to discover the essence of professional governmentality and the self-care professional development and to achieve the professional development through teacher’s community. This study conducts a narrative approach. The data are collected from eight teachers’ communication records with the school authority such as dialogue, meetings, formal and informal interviews, diary, reflection notes, line writing, other open materials, etc. and analyzed by listening, dialectical dialogue, telling the truth, confessing, self- writing of Foucault’s idea of the care of the self. In addition, the triangulation is applied to test the reliability. It concludes that 1. The cultivation of a professional principal is the development of the balance between ""movement"" and ""stillness"", the care for ""people"", and the pursuit of the ""truth"". 2. The essence of professional governance is the combination of ""reasonability"", ""intellectual"", ""sensibility"", and ""spirituality"". 3. The self-care development of teachers’ profession is motivated by the original idea of goodness, the educators’ guidance, and the organized working experience. It is also not determined by the ability and contribution.