Objective:To study the value of ZoomScope colposcopy in diagnosis of cervical diseases.Methods:378 patients with cervical diseases were examined by ZoomScope colposcopy (WALLACH 906043-SP type) from June 2002 to April 2003.The results of 378 patients by colposcopy were compared with Thin-prep Cytology Test (TCT) and histology diagnosis.Results:Colposcopy found normal transformation zone in 114 cases,cervical condyloma in 68 cases,aceto-white epithelium in 95 cases,twin signs in 65 cases,triple signs in 20 cases,cervical cancer in 4 cases,while unsatisfactory colposcopic findings accounted for l2 cases.The accuracy,specificity and sensitivity of colposcopy in evaluation of cervical diseases were 80.56%,74.60%,and 97.48%respectively.The accuracy of colposcopy in diagnosis of cervical diseases were 88.36% and 80.56% respectively as compared with TCT,histology diagnosis,and that of cervical cancer was 100.00% as compared with histology examination.Conclusion:ZoomScope colposcopy in diagnosis of cervical diseases can be accurate,reliable.When colposcopy is combined with TCT and to bospy for cervical diseases,the diagnostic accuracy rate of the precancerous lesions or earlier cervical cancer can be further improved.