Objective To study the value of ultrasonographic diagnosis of benign,borderline and malignant ovarian epithelial tumors.Methods In the 203 patients of ovarian epithelial tumors,the substantial tissues′ area of 128 cases with cyst-solid mass was measured through ultrasonography and compared with pathology.Results The area of substantial tissues in ovarian epithelial tumors was benign 5 cm 2 were regarded as optimal threshold values for differentiation of the benign,the borderline and the malignancy,their sensitivities were 94.7% , 80.0% and 90.7% ,their specificities were 96.3% , 92.4% and 97.6% ,accuracies were 96.1% , 90.0% and 92.9% .Conclusions It provides an effective method for diagnosis of benign, borderline and malignant ovarian epithelial tumors.If combined with conditions of color Doppler flow imaging, and comprehensive consideration on greater omentum and lymph node, the accurate diagnostic rate will be increased.