| In 2013, flat design of IOS7 has aroused great concern in society. Immediately, the sensitive word about flat design is pushed to the cusp. It takes the use of simple graphical elements on the interface design to show a stylized modern interface designed which marks the trend of cumbersome return to the minimalist, reflecting the characteristics of modern design which is contracted but not simple in this era. In the flat stylish interface, it is undoubtedly important whether the simple layout, straightforward graphics, simple font and bright colors is applied successful. In visual communication, the human sense of information of an object is color first, followed by the form, in the first 20 seconds of receiving the information, people’s sense of color is 80%, 20% of form. All phenomena is caused by the reaction the color and shading which comes from the outside world such as boundaries and differences shape of the object, space, location and so on. Excellent color design helps prolong the viewer dwell time of interface, alleviate people’s visual fatigue, have a good psychological effect. Therefore, the color has very important cognitive function. Given the color can have a psychological effect, this thesis focuses on the title to create a good design of flat stylish interface to provide the reference.First, this paper summarizes the research background and current situation of the flat design, points out the psychological effect of color for flattening the importance of flat stylish interface design; Secondly, in the paper, the study of color theory, color ways of psychological effect are summarized, the characteristics of each color system are compared, the use of Beijing commercial color system are limited as the basis of analysis. Then, it is concluded that the flattening the principles of interface design style by detailed of exploration about the cause of the flat design of interface, elements and characteristics of exploration. At the same time, by taking the APP interface design style as an example, which is in accord with characteristics of flat design and is analyzed by the quantitative way of Beijing commercial color system in China, psychological effect of APP interface is concluded and the way of color matching on flat design style interface is established; Finally, combining with the above content, using the established way of color design with interface design "western donkey tour APP" as an example, to evaluate the established color way based on color psychological effect in flat design style interface, making the results intuitive and credible.The research of this topic provides a theoretical basis to make a choice of the color of flat design style interface, helps the designers to operate actually, and makes the interface of flat design style more comfortable, humanistic and aesthetic in visual communication. |