The mass formula which was derived from the theory of unitary symmetrical group seems to be somewhat different with experiments. Now we have discussed this problem from the point of view of field interaction. The results show that the mixing effects of both T = 0 states, one belongs to the one dimensional representation and the other to the eight, give a correction to the mass of each of them, and the contradiction between the theory and experiment may be explained. Finally we have discussed the K-K resonant state.