In 20 16, Beijing Hanlong Industrial Co., Ltd. established Hanlong Document Protection Center to provide professional document protection services such as digitalization, analog reproduction, digital-analog integration, heterogeneous backup, document restoration, document deacidification, pest control, cleaning and dust removal, treatment of harmful gases in the collection environment, and digital restoration of audio-visual archives. Hanlong Document Protection Center has undertaken a number of rescue and protection projects for national and provincial libraries, archives, museums, ancient books, archives, classics, calligraphy and painting, etc., which have received unified attention and praise from many users and social media.