1. First of all, be calm, understand the facts, and do not reply easily. Read the content of the lawyer's letter carefully to see what type of intellectual property infringement it is. Is it trademark infringement or patent infringement, what specific patent is it, what is the patent number, etc.

2. Analysis of the unit that sent the letter:

If it is a large formal manufacturing enterprise, it is likely that it has already obtained preliminary evidence and made a preliminary analysis on the characterization of the infringement. Take it seriously. Of course, big companies are not perfect or professional enough.

If it is an intellectual property agency or other situations, first check whether it has authorization or whether it is a malicious lawsuit, etc.

3. Entrust a professional intellectual property lawyer for consultation.

Leave professional matters to professionals. For example, in the case of patents, patent lawyers conduct careful searches on the legal status and patentability of the patents. If they analyze and compare the search results, they can arrange reasonable rights protection or relief strategies.