It can be used and must be used. Article 79 of the "Security Law" stipulates that if the property rights in trademark exclusive rights, patent rights, and copyrights that are transferable in accordance with the law are pledged, the pledger and the pledgee shall enter into a written contract and register the pledge with its management department . The pledge contract shall take effect from the date of registration. This provision clarifies that the pledge of trademark rights in my country adopts the principle of registration effectiveness, and there is no need to transfer the possession of trademark rights. Therefore, the fact that the trademark owner still enjoys the exclusive right to use the trademark is determined by the nature of the trademark right itself.