Objective To explore the accuracy of frozen section of uterus specimen in stageⅠendometrial carcinoma. Methods There were 49 cases of stageⅠendometrial carcinoma during the period of January 1991 to December 2000 with coronal section, and to undergo gross, frozen section and paraffin section for diagnosis, The accordance and discrepancy in the results of tumor histology and invasive depth in myometrium were compared. Results The histological types by frozen section were exactly the same as those by paraffin section. The accurate rate in grading by frozen section was 85.71% when compared with paraffin section; The accordance rates in judging the invasive depth in myometrium between gross versus frozen section, frozen section versus paraffin section were 73.47% and 89.80% respectively.Conclusion To select the suspected site carefully will help to improve the diagnostic accuracy of frozen section in stageⅠendomertial carcinoma.