|（School of Law，Xiamen University，Xiamen 361005，China)
Abstract: For the first time in the Rio Olympic Games, CAS set up a special department called ADD (Anti-Doping Divi-sion) to specialize in solving Olympic doping cases, and orientated it as an arbitration institution of first instance. As mutu-ally independent departments, ADD and AHD (Ad Hoc Division) have similar stipulations in terms of arbitration court composition, arbitrator panel determination, arbitration court discretionary discretion, way of communication between procedure participants, official language and ruling period etc. However, the orientation of ADD as an arbitration institu-tion of first instance makes the differences between the two divisions mainly embody in the followings: if there is an “in-ternal relief exhaustion” limitation; if the cases can be sent directly to the CAS headquarters for ruling, way of ad hoc measures, final effect of ruling, etc. From the differences and similarities, it can still be seen that the CAS arbitration sys-tem follows the application of general legal principles, such as the recognition of the procedure justice principle, and in the mean time, adheres to the establishment of new principles with sports specialty features, such as the application of the strict liability principle, etc. Therefore, the cross application and establishment of basic legal principles and sports specialty rules is the main mode of establishment of sports arbitration rules included global sports law.
Key words: sports law；Court of Arbitration for Sports；Anti-Doping Division；Ad Hoc Division；arbitration rule；Rio Olympic Games