OnJune 23 2009，Europeand the United States jointly filed the complaint to the WTO Dispute Settlement Body(DSB)with respect to China's restriction on the exportation of rare materials.Though presented as a typical legal dispute in DSB，in essence，this dispute refl ects that states are competing for rarematerials.The key issue in this disputeis whether China can establish the evidence to prove the export restriction is consistent with GATTXX(g). Submission of data evidence should be emphasized.The dispute shows that China should establish equal internal and external protection mechanisms for materials.