First of all, we must determine the technical scheme for writing the patent specification, that is, the so-called technical disclosure book, and provide the attached drawings. Then, according to the difference between the technical scheme in the technical disclosure and the structure and configuration of the existing technology, or the part with the leading level, write the claim. The content of the claim is the difference between you and the existing technology. A utility model patent is a structure, and an invention can be a method or a chemical formula. Then use a text that can comprehensively summarize the contents of your patent as a patent abstract, and use a drawing that can explain the contents of your patent as your abstract drawing. Please contact me if you don't understand.