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