The designated props for Douyin's national mission are certain props or items specified on the Douyin platform, and users need to use the props or items to complete the mission requirements. These props or items can be anything related to the mission, such as a brand's products, specific clothing, props, etc. Users need to use the designated props or items when completing the mission and show them in the video to prove that they have completed the mission. By specifying props or items, the Douyin platform can attract more users to participate in the mission, and it can also provide better publicity and promotion opportunities for brands and merchants, thereby achieving a win-win situation.