Objective: To investigate the preparation technics and anti-tumor effects both in vitro and in vivo of a novel nanosphere control-releasing preparation of colchicines (an water-insoluble anti-cancer drug) by intravenous injection. Methods: With polylactate-poly ethanol acid copolymer (PLGA) as marix materials, we adopted ultrasound emulsification/dissolvent volatilization method to prepare PLGA enveloped colchicines of nano-particles (NP), proceeding the appearance signs of PLGA- colchicine-NP, making use o...