The online shop was complained of infringement. It was a buyer in Hangzhou who took some of my goods and received a court summons every few months. Should I ask a lawyer to go to court?

First of all, you have to hire a lawyer to go to court. You can consult a lawyer for evidence. Since the court has issued a subpoena, you can't ignore it. Let's face it. Even if you don't go, the court can decide according to the evidence. If you don't enforce it, the plaintiff can let the court enforce it, then your integrity will also be affected.