Patent application specification is a kind of patent application documents, and the specification is an important document in the patent application documents, which plays a role in publicizing the technical content of the invention and supporting the scope of protection of the claims. To obtain the patent right for invention-creation, it is necessary to submit a patent application specification to the State Patent Office and go through the necessary patent application procedures. Because the specification of a patent application is to be made public, the confidential content to be protected should be written in the claims instead of in the specification of the patent application. The main function of the patent application specification is to disclose the invention or utility model clearly and completely, so that the technical personnel in the technical field can understand and implement the invention or utility model. The openness of the patent system is realized by publishing the patent application specification. The specification of a patent application is also used to support the claims of a patent application, and can be used to interpret the claims when determining the scope of protection of the patent right for invention or utility model.