1. The substantive examination is conducted at the request of the applicant, and the applicant needs to pay a fee at the same time. If the applicant fails to pay this fee within the prescribed period or fails to make a request, the proposed invention will be The application, even if it has been published, will therefore be regarded as withdrawn, that is, it has been contributed to society in vain and no patent rights can be obtained. The request for preliminary examination is made by default when submitting the application. Applicants only need to pay the basic application fee and publication fee and submit documents that meet legal requirements to have their application enter the preliminary examination process. 2. The content of substantive examination is much more than that of preliminary examination, and the requirements are relatively strict. Higher standards are set in terms of novelty, creativity and practicality, the degree of disclosure of the description, and whether the claim drafting meets the requirements. If it meets the standards, it will be authorized; if it doesn't, it will be rejected. 3. Because the standards are higher and the examiner’s workload is greater, the substantive examination procedure lasts much longer than the preliminary examination. For example, the preliminary examination may only take 3 months, while the substantive examination often takes 1-3 years or even longer. time. During this period, the applicant needs to submit responses and modifications to the application documents within the specified time according to the examiner's requirements until the application documents meet the authorization standards. Otherwise the examiner has the right to reject it.