Objective\ To extract different portions from leaves and stems of sweet potato Simon No.1 and investigate their antitumor activities in vitro and vivo.\ Methods\ The portions were extracted from leaves and stems of Simon No.1 with water(SW),alchohol(SA) or chloroform(SC).\ Their antitumor activities were tested with K562,EAC,H22 cell lines in vitro and S180 sarcoma,U14 cervical carcinoma in vivo.\ Results\ IC 50 of SA on K562,EAC and H22 cell line...