according to the definition of American precedent, trade dress means "the overall image or overall appearance of a product". This trade dress can include "size, shape, color or combination of colors, structure, graphics, and even special sales skills". According to this context, trade dress can be regarded as a Design. According to the thinking of European and American legislation, patents, trademarks and even copyright laws can protect designs; However, legislation should avoid the overlapping of the three types of protection. From the perspective of economics, it is particularly important to clarify this kind of legislation, which is related to the effectiveness of market allocation and the fundamental creed of free competition.