1 and China National Intellectual Property Administration's domestic patent information retrieval system, which has collected all the invention patents, utility model patents and design patents since 85 years, can download the patent specification within 100 pages, and is the most authoritative patent retrieval system in China. 2. Intellectual bud patent inquiry platform 3. Wisdom bud patent inquiry platform provides a one-stop information service platform for patent retrieval, analysis and management. The company is committed to making more organizations and institutions around the world understand and use patents more effectively. 4. China National Intellectual Property Administration, China is the directly affiliated institution in charge of patent work and overall coordination of foreign-related intellectual property affairs in the State Council. It has intellectual property affairs such as patent application, patent examination, patent protection, patent agency, PCT, integrated circuit, literature service, news trends, laws and regulations, international cooperation, etc. 5. Patent inquiry is a procedure before patent application. It's not necessary, but it is. An effective search report can make the applicant avoid that the right to be protected is not the same or similar to the patent right of the earlier application, and ensure that the applied patent is valid. Abroad: 1. The patent retrieval website of the European Patent Office is a free patent literature database. 2. The United States Patent and Trademark Office has collected all patent documents published by the United States Patent Office since 1790. 3. Chartered Electronic Library of Japan Patent Office