The purpose of this article is to examine the "Annulment" of ICSID Arbitration Award. Most of the international conventions provide for arbitration as the preferred method of dispute settlement. In general they either provide for ad hoc arbitration under the UNCITRAL Rules or under the rules of an acceptable arbitration institution, e.g. ICC, AAA, LCIA and in particular ICSID. The most distinctive feature of ICSID arbitration is the self-contained and exhaustive nature of its review procedures. Unlike other arbitration regimes, control is exercised by internal procedures rather than by the courts. Remedies against the award are limited to those provided for in the Convention and do not include court involvement. Especially, the annulment of the ICSID award by an ad hoc committee must be considered as jeopardizing ICSID Arbitration because it clearly depart from the current trends of international commercial arbitration which limits any kinds of judicial review and excludes any kinds of review on the merits. I wish that the future decisions of the ad hoc committees will restore a narrow scope to the ICSID procedure of annulment in order not to endanger the ICSID Arbitration mechanism.