Abstract：The reservation to Article 1（b） CISG made by contracting states limits the application of the Convention to contracts between parties from reserving state and non-contracting state, and increases the chance of applying domestic law. Political need and the prudence are the major reasons for making the reservation. It reflects socialist countries’ hopes of more applying domestic law and the internal uniform law. At present, the political and legal situation for China’ s making the reservation has changed fundamentally．The social foundation to maintain the reservation does not exist already. Instead, China’s withdrawing the reservation timely is helpful to prevent uncertainty and complexity of legal application, to solve disputes fairly. It will reduce international trade barriers,and promote the legal uniformity in international trade. Withdrawing the reservation essentially is the issue of improving Chinese commercial law. It does not impair China’s legal sovereignty, the essential state interests deriving from other treaties with the feature of public international law.