Abstract: Rough concept lattice can reflect the certain and uncertain relationships between objects and attributes,and can deal with uncertainty knowledge.It is an important task to construct concept lattice efficiently in the applications．Analyzing the concept and structure of rough concept lattice,and combining with the construction of the general concept lattice thought,this paper proposed a layered construction algorithm,which is based on the decision-attribute value in decision context as the breakthrough point,and enriches the construction theory．The examples show that this algorithm is simple and intuitive,and gets good effect.

Key words: Rough concept lattice,Layered construction algorithm,Decision-attribute value,Approximation,Intent,Extent