With the constant advancement of the economy and technology, especially the development of high-tech technology, the traditional trademark can no longer meet the needs of social and enterprise development. From traditional visual trademarks to three-dimensional trademarks, sound marks, and even scent marks, non-traditional trademarks are playing an increasingly important role in transactions. Therefore, the legal protection of non-traditional trademarks is particularly important. By collecting and reading the relevant references and materials, this paper adopts the methods of literature analysis, comparison method, and case analysis to analyze of Legal protection of non-traditional trademarks from a global perspectivetaking scent trademarks as an example. The paper points out the current situation in the protection of non-traditional trademarks, taking scent marks as an example, and puts forward some feasible suggestions, such as: Reference the "staff " representation method, Promoting scientific and technological progress, and Scent branding prompts in the product. It can be concluded that the registration and protection systems of scent trademarks in various countries are not perfect, they can be shown in the strict requirements for registrable trademarks regarding the representation of odor, the distinctiveness of trademark registration, and the functional of marks. Countries should pay more attention to them. The study suggests that it is necessary to improve the scent trademark legislation, which is conducive to better protection of intellectual property rights, encourage innovation of enterprises, and safeguard the interests of enterprises.