Experiments of orthogonal design were used to select the optimum artificial dieis for Pachlioptera aristolochia(Fabricius). Four factors, including leaf flour of Aristolochiae tagala, wheat germs,yeast flour, Spirulina platensis flour, sorbic acid, each at three different level, were tested by assessing larval stadium, pupation rate, mean pupal weight. There were no significant difference between the optimal diets and bo leaf of A. tagala on the larval stadium and mean pupal weight to rear P. aristolochiae. The pupation rate of optimal diets Selected was significantly higher than those of other artificial diets