The conditions which prepare high-purity Lecithin with 1.5 cm×40 cm silica gel chromatographic column are systematically studied. The component of eluent is CH 3OH-CHCl 3 solvents with pH 3~4. The optimum gradient elution process is concave gradient eluting with the gradient of V(CH 3OH)∶V(CHCl 3)=(1∶2)~(2∶1). The volume of eluent is only 5~6 times of column volume, and the time of eluting is about 6 h.