Abstract: WTO dispute settlement mechanism,after nearly 10 years' function,has become the most important Intemational Tribunal,nevertheless,judicial activism whose forms are law-making and lack of deference to executive bodies by Panel and Appellate Body has been caused due to relatively weak legislative and executive bodies of WTO,ambiguity of WTO rules and some other things. Such kind of judicial activism is not only inconsistent with the provisisons of WTO agreements but also give rise to many serious problems which shoulb be avoided by the establishment of check and balance among the WTO's judicial,legislative and executive bodies.