In 2006, the UNCITRAL Working Group II started a new project on the revision of the UNCITRAL Arbitration Rules of 1976. Ever since that time, 9 sessions of the Working Group II were devoted to the discussions on such topic. The Arbitration Rules has been acknowledged to be used for settling international disputes involving various disputing parties. In recent years, many treaty-based arbitrations have been subject to the Arbitration Rules. This article focuses on the discussions made in the 52nd session of the Working Group II where the third reading of the revised draft of the Arbitration Rules was completed except for a few provisions. Among the draft rules, the delegations were hardly able to reach an agreement with regard to Articles 2(2), 34(2), 41(3), (4), and (6). It is expected that those provisions would be agreed in the coming 43rd plenary session of the UNCITRAL. The use of the Arbitration Rules is dependent on the agreement by the disputing parties. It is not like the UNCITRAL Model Law on International Commercial Arbitration which was adopted in Korean legal system in 1999. However, the proper functioning of arbitration rules is essential for the efficient and successful operation of the arbitration system in a particular country. That is the reason why we should keep close attention on the discussions of the UNCITRAL with regard to the revision of the Arbitration Rules.