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Electrical bushings are the fundamental components of high voltage power transformers and their reliability is crucial for their successful operation. The majority of power transformer high voltage bushings today are of the condenser oil impregnated paper (OIP). High voltage insulated bushings are required to bring out the electrical energy through earthed barrier. This paper deals with improving the electric field distribution inside 800 kV OIP condenser bushing by varying number of foils and their thickness using finite element method. Simulation results show that 18 foils of 4mm thickness each and 6mm gap between the foils is optimum for better distribution of the field.