In response to overcome shortcomings of the existing approaches for thief zone classification which concentrates on the absolute index while ignoring relative index, we take Gudong oilfield as the investigation object, employ numerical simulation and reservoir engineering method, and establish type curve for thief zone classification with relative injection rate and injection intensity ratio, on the basis of distinct flow principles, we form different thief zone evolution levels. Moreover, the non-Darcy flow is also taken into account which may occur for severer level, and then the thief zone is classified into four levels: non-thief zone, normal high-permeability layer,high-permeability streak and high-capacity channel. The type curve has conquered the limitations of conventional method, and completely demonstrated the relativity of thief zone, and only injection profile is needed to make the classification, which is very convenient for oilfield application. It has been used to Gudong Ng63+4 development unit, and the classification result is in good accordance with time-dependent reservoir numerical simulation and tracer test, which has substantiated its validity.