The mathematical model is established for energy consumption caused by the compression resistance force, damping force of seal venting hole and air bind resistance between two seals during the side swing door closing process. The energy consumption of a certain vehicle's right front door sealing system is calculated by the loop iteration method using VBA language of EXCEL. The results show that total energy consumption of sealing system is 2.78J while three parts energy account for 28%, 25% and 47% respectively. Thus the damping force of seal venting hole and air bind resistance between two seals are important influence factors of seal energy consumption.