Legal analysis: 1. Public awareness of the trademark. 2. Duration of trademark use. 3. The duration, degree and geographical scope of any publicity work on trademarks.

Legal basis: Article 13 of the Trademark Law of People's Republic of China (PRC) is a trademark well known to the relevant public. If the obligee thinks that his rights have been infringed, he may request the protection of well-known trademarks in accordance with the provisions of this law.