[Objective] To explore the ultrasonographic features of incomplete abortion and analyze the reasons. [Methods]Three hundreds and sixty-nine patients suspected as incomplete abortion were examined, the charecteristics of ultrasonography were analyzed. [Results] The ultrasonographic features of incomplete abortion included 5 styles: enhanced echo imaging fingds; weak echoic reflection; tangled echoic reflection; fluid echoic reflection; no-abnomal echoic reflection. [Conclusion...