The intangible cultural heritage skills of the Li people in Hainan come from the ancestors’ long-term practice and thinking of the external environment and the relationship between things and themselves. It is the ancestors’ dialectical understanding of the “Id” and “Self” of the environment in Li people. On the basis of combining the current living conditions and the demand of using function, the expression of “Super-ego” of regional humanistic connotation will be finished finally. In today’s social context, intangible cultural heritage skills of Hainan Li people take the rural residential buildings as the form and function carrier, providing the realistic basis and sustainable development path for the contemporary transformation of Li people intangible cultural heritage skill.