Combining with the provision of Article 3.2 of DSU, and the practice of WTO Dispute Settlement, Article 31 “General Rule of Interpretation” of VCLT has become the binding rule when interpreting WTO legal texts in the WTO dispute settlement. Therefore, the “relevant rules of international law” which are not WTO legal rules themselves, should be taken into account when interpreting WTO legal texts. To fully implement the provision of the article above, firstly, it should be made clear that, the “relevant rules of international law” can be only used to interpret WTO legal texts, and then the connotation and scope of such rules should be specified accordingly.