Abstract: In the light of the situation that the gathering system is seriously corroded by the produced water, the grey relational analysis method is used for relational study on the all factors affecting the corrosive ability of the produced water and the ranking results are obtained. The result shows that the major factors influencing on the corrosiveness of the produced water are the total mineralization, pH value, Cl^-, Ca²⁺, HCO^-3 and TGB contents. The authors consider that the method of grey relational analysis provides a new way to study the corrosion of produced water in Tahe Oilfield efficiently.