At second transfer roller process in electrophotography system, paper deformation is caused by electrostatic force stronger than the rigidity of a paper, which might cause paper jam. We are studying to understand the mechanism of paper deformation by charge generated on a paper. So a numerical simulation tool is developed in order to analyze the paper deformation by the effect of transfer parameter. And also we observe paper deformation occurred by electrostatic force. The calculation results are compared with experimental results. The calculated tendency to paper deformation results shows good agreement with the experimental results.