The technical information of patent information disclosure involves almost all technical fields of human life activities. According to WIPO statistics, 90%-95% of the world's inventions can be found in patent documents every year, and many inventions are only disclosed through patent documents, and no other scientific and technological documents have been reported. The United States Patent and Trademark Office conducted a survey in the 1970s and found that 70% of the contents had not been published in non-patent literature. It can be seen that patent literature is the source of many technical information. If we don't pay attention to the patent literature, we may lose the opportunity to obtain this information.