For two layer laminated body consisting of epoxy resin and FR-4 substrate, the warp deformation behavior caused by thermal load from heating to cooling was examined from thermo-viscoelastic analysis based on the linear viscoelastic theory and experiment. It was clarified that the warp deformation behavior for the laminated body was affected not only by elastic modulus and linear thermal expansion coefficient of the composition materials but also by the ratio of the material thickness and bending rigidity of composition materials, and that the warp deformation behavior during heating and cooling processes could be predicted by thermo-viscoelastic analysis considered from the temperature and time dependency of the composition materials.