To evaluate the effectiveness of conization in the diagnosis of cervical cancer, the histopathologic finding of 464 consecutive cases were analized with respect to the cytology, punch biopsy and hysterectomy. Cold knife conization was performed under direct visualization(naked eye conization) from January, 1987 to Octorber 1994 at department of Obstetrics and Gynecology, Kosin Medical Center. The results were summerized as follows : 1. The rate of agreement and underdiagnosis of between pap smear and naked eye conization were 43.7% and 47%. 2. The rate of agreement and underdiagnosis of between punch biopsy and naked eye conization were 64.5% and 21.8% 3. Subsequent hysterectomy was done on the 382 case and their incidence of residual disease rate was 44.2%(169 cases). Their incidence of residual lesion was increased with severity of the carcinomatous change. 4. The rate of complication undergoing conization was 8.4%(39 cases).