The submandibular gland is one of the major salivary glands, salivary diseases frequently occuring site due to its anatomical weakness. This retrospective study evaluated data pertaining to history, sex, operation method, age distribution, diagnosis through the chart, operation record, radiographs, histologic finding of 51 patients operated on for the submandibular gland excision from 1986 to 1995 in our hospital so that we improve on the understand of the salivary gland diseases. The results were as follows 1. The chief complaints was mass, swelling mainly. 2. The ratio of affected site was 47.1: 5I in left : right respectly, both sites was 1 case especially. 3. The ratio of men to women was 56,9: 43.1 4. The operation performed all through the extraoral approach. 5. The sialolith presented at 24 cases. 6. The most patients had a two weeks duration period. 7. The age distribution was the third decade(29.4%), the second decade(27.5%) in order. 8. The symptoms accompanied the chief complaints was pain(37.3%), mass(17.6%), swelling (13.7%), trismus(13.7'%) in order. 9. The diagnosis was sialadenitis with stone(S.W.S.)(45.1%), sialadenitis without stone(S.W.O. S.)(17.6%), pleomorphic adenoma(P.A.)(15.7%), abscess(Abs)(5.9%), tuberculosis(Tbc) (5.9%) in order.