Since 1920's, sports becomes an international matter among states due to its internationalization. A loose scope of international law of sports is therefore initiated so to resolve the disputes caused therefrom, which includes certain mode of bounding arbitrations. Three modes of dispute resolution were introduced. They are either through single Olympic Committee, domestic judicial institutions contemplating as proper forum, or international court of arbitration for sports. Due to the possible further litigations and the needs of professional and authoritative judgment, most of the international disputes over sport activities are resorted to the forum of the Court of Arbitration for Sport (CAS). Observing the 1958 Arbitration Convention the sport arbitration procedure allows the parties to select arbitrators which renders the decisions of them as final and binding over the parties. Initially the forum adjudicates only civil and non-technical disputes related with international sport activities between private parties. Hence it will not consider the issues between international organizations. Yet its function is thereafter expanded due the revision of the Charter of International Olympic Committee and arbitration rules. The increasing cases of the Court of Arbitration for Sport evidences its practical functions and authorities in the spectrum of international sports activities, and also the necessity to introduce its organizations, bylaws and practice with this article.