Art has always been a popular major, and color is one of the compulsory subjects in the entrance examination for art majors. The color test mainly examines students' ability to know, understand and use colors, as well as their ability to express colors. Among them, gouache still life is mainly about writing scenery or sketching. Therefore, gouache still life painting is often used as the main training method. To draw a good gouache still life sketch, we should first pay attention to cultivating our own color perception ability, because only what we feel can be accurately expressed. So how can we find the color sense? I think we should train from the following aspects: First, it is undeniable that we should have the basic knowledge of color theory, and color learning mainly depends on feeling, which is an important condition for learning color and a talent, but we need to enrich the basic theoretical knowledge to make this talent develop better. Color perception is a reflection of psychological factors, which can be formed and changed through the influence of internal and external conditions. Every student can write down the theoretical knowledge he should know as a mathematical formula. When painting encounters difficulties, he can use these regular knowledge and laws to deal with them and use color theory to find a solution to the problem. With the accumulation of theoretical knowledge, the ability of color perception will be improved, and the level of expressing color will be improved accordingly.