Prognosis of carcinoma is variable and can not be predected from the initial clinical finding. In some cases it recovers permanently while in others it has recurrence, although the clinical findings themselves are quite the same at the beginning of the treatment. In some cases it prognosis rapidly to death in a very short period of time while in others it takes rather a mild course. Thus it is likely that there is a difference in degree of malignancy of carcinoma of the cervix. Regarding the histological grading of malignancy of cervical carcinoma much has been written up to the present, but it is not clear whether or not this grading will correspond with clinical prognosis. Under such circumstances it is note worthy that professor IMAI of the Department of Patholology, University of Kyushu, suggested a new classification of carcinoma in 1949. The present paper deals with the results of the studies on malignancy of carcinoma of the cevix carried out on the basis of that classifcation