Abstract: The article aimed to research the oil decoloration process usefully.Used the two-stage bleaching method, the first step was to use renewable clay to pre-bleache, the adding amount of recycled clay was 0.7%, and remove the most heat-sensitive material, the removal rate of thermal material was 96%, then carried out the second step decolorization to select the most best bleaching conditions:the adding amount of clay was 1.2%, bleaching time was 30min, stirring speed was 250r/min, and the bleaching temperature was 100℃.In the end, obtained under these conditions, color was stable and difficult to return color.