Objective: To explore the impact of polyethylene glycol-20000 (PEG-20000) on carring drug ability of cytarabine (Ara-C) liposome. Methods: Cytarabine liposome was made by reverse evaporating method from egg yolk lecithin, the surface of cytara-bine liposome was coated and modified with different concentrations of PEG-20000. The carring drug ability of PEG-20000 modified Ara-C liposomes was evaluated by means of measurement of encapsulation efficiencies, mean size diameters and leakage rates of drug. Results...