It can be used, and it must be used. Article 79 of the Guarantee Law stipulates that if the exclusive right to use a trademark, patent right or property right in copyright that can be transferred according to law is pledged, the pledgor and the pledgee shall conclude a written contract and register the pledge with their administrative departments. The pledge contract shall take effect from the date of registration. This provision clarifies that the pledge of trademark rights in China adopts the principle of effective registration and does not need to transfer the possession of trademark rights. Therefore, the trademark owner still enjoys the exclusive right to use a trademark, which is determined by the nature of the trademark right itself.