The population screening has been recognized as an efficient means of diagnostic cytology in early carcinomas of the cervix. A microspectrophotometry apparatus was designed based on our original method with bundled glass fibers for scanning of malignant cells. Evidence presented is as follows: 150 cases out of 177 cases of female subjects are positive (84.7%), 3 of 72 cases (4.2%) are false negative, and 24 of 165 cases (22.9%) are false positive in automated screening rate.