As a part of the intellectual property protection system，trade secrets play an important role in business management and market competition. However，judicial protection of trade secrets has many problems. On the basis of sorting out cases involving infringement of trade secrets in Shenzhen in 2019，this article summarizes the basic characteristics and legal difficulties of cases of infringement of trade secrets through case studies，data statistics，and data analysis. There are many types of business information involved in trade secret cases，the type of infringement is complex，and the procedural issues cover multiple aspects. This article analyzes and summarizes the seven common business information judicial judgments on whether they constitute trade secrets based on specific case conditions，and four common market behaviors，whether it constitutes a judgment on the infringement of trade secrets，as well as some difficult and procedural issues in some criminal-civil cross cases，emerging the “Shenzhen sample” in the practice of trade secret trials.