The determination of dumping is an important problem in the anti-dumping law. This is a premise of existence of the industry injury and a condition of collection anti-dumping duties. The determination of dumping involved three parts: determination of normal value and export price, regulation between both. This article focuses on the determination of normal value and export price and put forward some advices to the current law by analyzing the WTO anti-dumping rule and Chinese new anti-dumping regulation. It will bring positive effect on the legislation of Chinese anti-dumping law.