Developed countries especially United States of America(USA) and Canada hadn't taken any Countervailing Measures(CVM) against China before 2004, because they regarded China as a non-market economy(NME) country, and they thought NME country didn't exist the market price, and it is difficult their to calculate or apply the CVM rate in NME country. But China was invoked by Canada and USA with anti-subsidies investigation since April 2004 still they regarded China as a non-market economy(NME) country. So this paper will mainly analyze the case concerning among China, USA and Canada anti-subsidies investigations against China in the Special Import Measures Act(SIMA) in Canada, United States Countervailing Duty Law(USCVD) in USA, WTO SCM Agreement, and discuss the substantive claims of contracting parties, and find the problems of Chinese subsidy system and Chinese granted' WTO SCM Agreement. Through these cases, Chinese government should adjust its domestic industrial system and subsidy system which will lead to international disputes especially prohibited subsidies.