EGR (exhaust gas recirculation) technology can significantly reduce NOxemissions from an engine, especially when used in conjunction with an EGRcooler tank. This paper presents the calculation method, building model,simulating of the cooling tank, applying numerical simulation to calculation anddesign of EGR coolers. The results show that with the EGR rates of 30% and 40%the selected cooling tank structure as a tube-beam heat exchanger, it iscompletely possible to use the heat exchanger tubes, which are smooth tubes, tomeet the cooling needs of the circulating gas when the lowest possible coolingtemperature is down to 115˚C for the circulating gas at the outlet of the coolerand the maximum flow of water to be supplied to the pump is 0.911kg/s. AnsysFluent software is used in this paper to study the flow field and temperaturedistribution inside the cooler.