Objective To observe the morphologic changes of immature dendritic cells(imDCs) before and after the electransfection of human hepatic cancer cell RNA. Methods Monocytes were purified from human peripheral blood, and induced into imDCs. Then human hepatic cancer cell RNA was electransfected into monocytederived imDCs. ImDCs were identified by the immunocytochemical method with 7 specific antibodies before and after electransfection. These dendritic cells were observed by scanning electron microscopy. Results After electransfection of human hepatic cancer cell RNA there were few changes of molecule expressions in imDCs. ImDCs were in round, oval and irregular shapes before electransfection. Their sizes were not identical but all bigger than monocytes. There were many protrusions in different shapes which looked like dendrite, or/and bubble, veil cloud on the surface of these imDCs. Although there were some cell fusions and cell deaths after electransfection, most imDCs recovered from the damage. Electransfecting human hepatic cancer cell RNA into imDCs would make pores on cell membrane.Conclusions The pores on cell membrane make it possible that the exogenous material enters imDCs. This study can prove the possibility of electransfecting human hepatic cancer cell RNA into imDCs to make cancer vaccine, which provides a new way for tumor biologic therapy.