The invention relates to a method and a system for optimizing an oil-impregnated paper condenser type bushing. The method comprises the steps of obtaining structure parameters of the oil-impregnated paper condenser type bushing, and building a two-dimensional electric field simulation model; inputting material parameters of the oil-impregnated paper condenser type bushing in a dry state to obtain electric field distribution in the dry state; inputting a damped degree and material parameters under the damped degree to obtain electric field distribution under the damped degree; comparing electric fields, electric field non-uniform coefficients and maximum field intensities in the dry state and a damped state to obtain a field intensity distortion coefficient of the oil-impregnated paper condenser type bushing due to moisture; detecting whether the field intensity distortion coefficient is in a set range or not, and if not, adjusting structure parameters of the oil-impregnated paper condenser type bushing according to the field intensity distortion coefficient and updating the two-dimensional electric field simulation model; and performing subsequent processing in the same manner until the obtained field intensity distortion coefficient is in the set range, thereby optimizing the oil-impregnated paper condenser type bushing. According to the method and the system, the reduction of the overall performance of the oil-impregnated paper condenser type bushing due to the moisture can be reduced.