This paper proposes a minimization optimization method of cutting load in receiving power system considering linearized constraints of top oil temperature of transformers. First, based on relation curve between the transformer oil temperature and loads, the linearized constraint of transformer oil temperature is established. And then, a minimization optimization model of cutting load in receiving power system considering linear constraints of upper oil temperature of transformers is proposed. This model contains optimization variables of 110 kV breaker’s 0-1 states and cutting loads of 220 kV transformers. The objective functions are the minimization of cutting load in receiving power system, and the constraints include the real power balance equations, the radial 110 kV power grid equation, as well as the above-mentioned linearized constraints of oil temperature of transformers, and the new model is formed eventually. Because this model is a mixed integer quartic programming problem, CPLEX tools are used for solving it. Finally, a large 220 kV/110 kV receiving power system is simulated and analyzed, verifying that the proposed model is effective. This work is supported by Natural Science Foundation of Chongqing (No.cstc2015jcyjBX0033).