Coen Brothers'film noir is unique in the international film world with its unique narrative style and fascinating image world.Their works have injected fresh vitality and creativity into the continuation of film noir,describing the life of people on the edge through intricate and bizarre stories,expressing the two directors'thoughts on philosophy and the tragic propositions of ancient Greece.By combing the origin of Coen brothers'film noir and traditional film noir,and focusing on the analysis of the role of color in the spatial geography,emotional perception and characterization of the Coen brothers'film noir,this paper summarizes the aesthetic significance of color in the Coen brothers'film noir.This paper tries to analyze the color art style of Coen brothers'film noir by using the method of comparative study and case analysis.