His current practice includes patent prosecution, patent invalidation process and client counseling with a focus on biotechnology and pharmaceutical. Weixiang Li has also provided services of patent retrieval and infringement analysis. He is skillful in drafting application documents in such fields as biochemistry, immunology, microbiology, molecular biology, molecular genetics and pharmaceutical technology, etc, and experienced in preparing responses to office actions in the substantive examination proceedings, and handling reexamination and invalidation cases in the above fields. He is a member of All-China Patent Agents Association.