With 10.75Gy X-ray irradiation,the chlorophyl contents in the first pair of leaves decreased in Bragg and supernodulated mutants. The decreased quantities in nts382 and nts246 were more than that in Bragg. There were a lot of leaf figuration and chlorophyl aberrations occuring in the leaves of Bragg and the mutants. With 10.75Gy treatment,the effects ofgrowth inhibition on nts382 and nts246 were more significant than that onBragg. The numbers of nodules per seedling in supernodulated mutants more severely decreased than that in Bragg when they were treatedat 10.75Gy or17.20Gy. With the numbers of nodules decreasing,the average weight of the nodule increased in times. These results mentioned above indicated that supernodulated mutants,nts382 and nts246, became more sensitive to radiation than Bragg.