Vitamin D3 (VD3) proliposomes (VDP), consisted of hydrogenated phosphatidycholine (HPC) and VD3, were prepared using supercritical anti-solvent technology (SAS). The effects of operation conditions (temperature, pressure and components) on the VD3 loading in VDP were studied. At the optimum conditions of pressure of 8.0 MPa, temperature of 45 ℃, and the mass ratio of 15.0% between VD3 and HPC, the VD3 loading reached 12.89%. VD3 liposomes (VDL) were obtained by hydrating VDP and the entrapment efficiency of VD3 in VDL reached 98.5%. The morphology and structure of VDP and VDL were characterized by SEM (scanning electron micro-scope), TEM (transmission electron microscope) and XRD (X-ray diffractometer). The structure of VD3 nanoparti-cles in HPC matrix was formed. The size of VDL with an average diameter of about 1μm was determined by dynamic light scattering instrument (DLS). The results indicated that VDP can be made by SAS and VDL with high entrapment efficiency can be formed easily via the hydration of VDP. The effects of operating conditions (temperature, pressure and components) on the VD3 loading in VDP (VDP), consisted of hydrogenated phosphatidycholine (HPC) and VD3, were prepared using supercritical anti-solvent technology the VD3 liposomes (VDL) were obtained by hydrating VDP and the entrapment. The VD3 liposomes (VDL) were obtained by hydrating VDP and the entrapment efficiency of VD3 in VDL reached 98.5%. The morphology and structure of VDP and VDL were characterized by SEM (scanning electron micro-scope), TEM (transmission electron microscope) and XRD (X-ray diffractometer). The structure of VD3 nanoparti- The size of VDL with an average diameter of about 1 μm was determined by a dynamic light scattering instrument (DLS). The results indicated that VDP can be made by SAS and VDL with high entrapment efficiency can be formed eas ily via the hydration of VDP.