With the development of tourism,the built environment of ancient town possesses dual nature and presents two dimension evolvement character.Based on discrimination of the concepts of human-settlement environment and human-landscape environment,this paper analyzes the evolution track of built environment of ancient towns in China,and explores the evolvement mechanism in depth.To seutle evolving problems and conflicts,this paper suggests that the outlet relies on cooperating evolvement and harmonious intergrowth between human-settlement environment and human-landscape environment of ancient town.Then,taking the Bayu ancient town as an example,the advancing mode and tactic for the evolvement are discussed.