Since 2008, "cloud" has been very popular, and words such as "cloud computing", "cloud security" and "cloud storage" have mushroomed in major media. The cultural publishing industry is not far behind. The "cloud publishing" of China Plate Group, the "library in the cloud" of Shanda Literature and the "cloud reading" of Founder Sweet Potato Network appear in people's field of vision ... The industry calls the network providing resources "cloud". The resources in the "cloud" can be infinitely expanded by users, and can be obtained at any time, used on demand, expanded at any time, and paid according to use. This feature is often called "IT infrastructure used like water and electricity". The essence of "cloud" should be polycentric, similar to the meaning of "web2.0". In other words, unlike the centralized supply technology with high cost and low utilization rate in the past, the current supply is distributed and convenient to apply. The core of the transformation from centralized supply to cloud supply is the development of technical means, which makes it possible to reduce communication costs and distribution costs. Books of "cloud reading" are not stored locally, but used on demand; "Cloud reading" only takes up part of the book space part of the time, saving the storage space of books; "Cloud Reading" can change the books in your hand at any time to achieve zero delivery. With the development of information technology, "cloud" service has been transformed from concept to reality, and "cloud reading" service is no exception. The "cloud reading" platform launched by Sweet Potato Network will provide comprehensive "cloud" services for Chinese book search engine, e-commerce platform and federated media publishing system. The "cloud reading" search engine will become a personalized private library for everyone or every family. It will not cost users money, nor occupy users' time and living space, but it will allow users to read e-books at any time, any place and any media.