Trademark inquiry refers to the one-step work done before you register a trademark. What you need to do is whether there is the same situation, whether there is a similar situation, and what categories you need to query. Trademark inquiries can be made by themselves to exclude some obvious ones. However, it is suggested that reasonable suggestions should be given under the inquiry of professionals. There is a trademark inquiry agency that does a very good job. Bajie Intellectual Property Office makes manual inquiries and gives timely suggestions.