Revision of arbitration is a post-award remedy provided for in ICSID convention, which allows awards to be substantially revised. Up to now, all applications for the revision to which the tribunal has made its decision, have been dismissed for inadmissibility, without starting the merits stage. In the context of international investment arbitration, existing studies focus on the issue of admissibility mainly in arbitration procedure rather than in revision procedure. According to existing cases, admissibility in revision procedure is different from that in arbitration procedure, while similar to the issue of claims manifestly without legal merit, for both of two involving review of the merits. However, the factors and standard tribunals adopted for the judgment of admissibility in revision procedure result in in-depth overlap between admissibility stage and the subsequent merits stage, making admissibility in revision a filter of applications which cannot assure successful revision, rather than that of frivolous application.