1. Determine keywords according to the technical scheme you want to apply for. 2. Search for existing patents on the patent search website according to keywords, and analyze whether it is similar to the patent you want to apply for.
Legal basis: Article 91 of the Detailed Rules for the Implementation of the Patent Law of People's Republic of China (PRC). The patent administrative department of the State Council shall provide the public with patent bulletins, pamphlets on application for invention patents and pamphlets on invention patents, utility model patents and design patents free of charge.