Abstract:The quantitative relationships of 14 taxa of Paris were calculated, using their content of steroidel saponins, with L. B. Thien, W. H. Heimermann, and R. T. Holman‘s fomula which was used in calculating the quantitative relationships of chemical components of plant. The result of the calculation is Rxy (the relationship index between each two species) . The relationship of a species to the group as a whole was calculated by summing the Rxy values for that species. Then a figure of quantitative relationship was drawed. ( Fig. 1) The result was the contents of steroidel saponins of P. cronquistii and P. japonica were very similar with 12 other species of Paris., the contents of steroidel sapo-nins of P. fargesii and P. bashanensis were very different from 12 species of Paris. The components of steroidel saponins of the two species were very parti-cular.