Dry-type bushing are widely employed in extra-high-voltage transmission systems, however, residual stresses tend to develop in their capacitor cores during the curing process, potentially compromising insulation performance. This study investigates the curing kinetics of epoxy-impregnated paper, develops a simulation model to analyze the residual stress distribution during the curing of dry-type bushing, and constructs an electric field distribution model by introducing internal defects into regions of high residual stress within the capacitor core. The results reveal a non-uniform distribution of internal residual stresses during the curing process. Significant stress accumulation is observed near the interface between the aluminum conductor and the epoxy-impregnated paper. The maximum residual stress of 27.43 MPa occurs at the lower end of the interface. Moreover, air gaps and microcracks caused by residual stresses can lead to a non-uniform electric field distribution on both sides of the capacitor core. The findings of this paper provide a theoretical basis for enhancing the insulation reliability of dry-type bushings.