摘要
According to the shortcoming of calculation inefficient of the existing attribute reduction algorithms of food safety system, it defined a new attribute reduction algorithm-attribute reduction algorithm based on roughness. The algorithm introduced roughness; Beginning with null set and taking roughness as selection criterion of condition attribute; Got the new union by adding the minimum roughness into reduction set step by step; Reduced search space using recursive method until the universe was empty and got reduced attribute set. Finally, the availability and efficiency of the algorithms were demonstrated.