Reducing fuel consumption is a major challenge for vehicle, especially for SUV. Cooling loss is about 30% in total energy loss under NEDC (New European Driving Cycle) cycle. It is necessary to optimize vehicle thermal management system to improve fuel economy. Otherwise, rapid warm-up is beneficial for friction reduction and passenger comfort in cold-start. Vehicle thermal behavior is influenced by cooling system layout, new technology and control strategy.Thermal management simulation is effective to show the energy flow and fuel consumption under the influence of new technology under NEDC cycle. So 1D thermal management simulation model is created, including vehicle, cooling system, lubrication system and detailed engine model with all friction components. And the interrelations between all the components are considered in the model. For model calibration, large amount of data is obtained from vehicle tests such as transient fuel consumption and transient coolant temperature. Base on the accurate model, electric water pump, split cooling, controlled oil pump and other technology are applied to show the influence of fuel consumption and warm-up behavior during drive cycles of NEDC under 20°C and -20°C ambient temperature. And all the modifications are verified for reliability under the worst cycle. And the most effective technology will be applied for new generation engine of GWM (Great Wall Motor company Limited).