It is the competition principle to Select the superior and eliminate the inferior,the survival of the fittest.The firm resource is the foundation and source of the competitive advantage,the competitive advantage is the footstone of firm survival and development.The paper takes for researching on the relation of firm resources and competitive advantage is researching on the formative and sustained relation of firm resources and competitive advantage.The heterogeneity of Firm Resource decides the form of competitive advantage,however imperfectly imitable,mobile and substitutable firm resource decides the sustainability of competitive advantage.