In the preliminary examination of an application for a patent for utility model, the scope of obvious substantive defects is larger than that of the preliminary examination of an application for a patent for invention. In addition to the problems of protecting the object, singleness and out-of-scope modification of the application documents, it also includes the problems of novelty and practicality, whether the specification is clear and complete, whether the claims are clear and whether it is based on the specification, and whether to grant multiple patents to the same invention and creation.