the personal traits, behaviours and the ability to change the style in different situations of King of Thailand His Majesty King Bhumidol Adulyadej. It showed that King Bhumibol is recognized to have these traits, such as charismatic, extraverts, high agreeableness, openness to experience, positive emotional stability, high emotional intelligence, high conscientiousness, integrity and hard- working. This essay also showed that King Bhumibol posses the leader behaviours that oriented toward people and charisma leadership style. In addition, he can change his leadership style to suit different circumstances. Because of his traits behaviours and contingent to change in different situation, his hard work and great dedication to Thai people and community, therefore, King Bhumibol is a great leader and he always lives in the heart and mind of Thai people.