The purpose of this study was to analyzed the importance causes of recognizing specific core competencies as basic occupational skills as selecting field early childhood educators as participants. This study was aimed at seeking educational methods to enhance core competences that are important on the job by improving the level of core competences. A total of 11 field early childhood educators(director, vice director, head teacher, teacher) in Jeonnam were selected as research participants and interviewed in depth. the results of in-depth interviews with field early childhood educators on why core competences were important were categorized as 修身: promoting the holistic development of children, 易地思之:understanding other mothers and fellow teachers who have different ideas, and 通卽不痛, 不通卽痛:communicating for problem solving. As a specific results First, field early childhood educators mentioned that the effect was negative to the early child if you cannot control your body and mind in a healthy and stable way as an early childhood teacher, therefore self-management competence was important. Second, field early childhood educators had experiences such as difficulties in forming relationships with their mothers and fellow teachers, difficulties in cooperating with fellow teachers. In order to make the life of the organization smooth, field early childhood educators were aware of necessary to have interpersonal competence such as emotional ties and cooperation in which the mind can count the minds of other mothers and fellow teachers. Third, field childhood educators expressed their difficult experiences because they could not communicate with fellow teachers during the daily work process. To solve this problem, field early childhood educators were aware of communication competence importance related to discussion and coordination, listening and speaking are necessary for the smooth work process between parents and fellow teachers.