Logo is the English expression of logo or trademark, which is the change of Greek logos and the product of modern economy. It is different from the ancient imprint. Modern signs bear the intangible assets of enterprises and are the medium of comprehensive information transmission of enterprises. In the process of corporate image transmission, it is the most widely used, the most frequent and the most critical element. Through constant stimulation and repeated portrayal, it is deeply left in the hearts of the audience. However, logo is not a trademark. We have to take logo to the Trademark Office to apply for registration. Only by successfully registering a trademark can the brand be protected by law.