The sealing structure of the aircraft door and fuselage cover is very important for the aerodynamic shape and the airtightness of the cabin. However, the improper sealing structure design will result to the problems such as poor sealing or worsen aerodynamic surface flatness. As the common sealing structure deformation analysis methods involve non-linearity of material and contact calculation, the analysis process needs large calculation cost. According to the principle of minimum potential energy, a simplified element with the loading characteristics of the seal was constructed by fitting the compression characteristic curve of the seal element. Commercial software and simplified element were used to analyze the deformation of sealing structure. The results show that the simplified element can improve the calculation efficiency of sealing structure deformation, meanwhile, the calculation accuracy is related to the goodness of curve fit, which can be applied to the finite element analysis of doors structure and have certain engineer application value.