Objective To explore the clinical diagnositic code(CDC)in ovarian endometrial cysts (OEC).Methods 218 cases of pelvic masses were investigated by use of symptoms,signs,B mode sonography and CA125.172 cases were diagnosed with OEC out of 218 cases,While 46 cases were ruled out by combination exploratory laparotomy and laparoscopy.Meanwhile we compared it with revisional american fertility society(r-AVS)including diagnosis and staging.Results The operation results of 218 cases were compared with the results of CDC and its Diagnositic Sensitiveness;Specificness;Positive predictive value;Negative predictive value;Diagnositic accordance rate as well as Diagnositic index of CDC were 96.4%,79.6%.93.0%,90.0%,91.7% and 73.4% respectively(χ2=127.818,P＜0.001).Further more,172 cases of OEC which diagnosed with CDC were further subdivided into three stages as 1,2,3 according to its score,mild;moderate;heavy and this stage category were compared with the category of AFS(Ⅰ-Ⅱ,Ⅲ,Ⅳ),the Diagnositic accordance rate of two categories were 95.6%,95.6% and 83.0% respectively,No significant difference were found in Var.mitis and medium-sized(χ2=0,P＞0.05).but the Medium-sized and Gravis tape was significance(χ2=4.472,P＜0.05).Conclusion CDC has a better coincidence with operation in the diagnosis of OEC which can be used in the non-traumatic diagnosis and staging of OEC in clinic.