OBJECTIVE Levodopa solid lipid nano-particles(LDP-SLN)was prepared,and an efficient method for determination of entrapment efficiency(EE%)was established.METHODS LDP-SLN was prepared through the micro-emulsion technology prepared by drawing ternary phase diagram,The morphology was examined by transmission electron microscope,the particle size was determined by laser granularity equipment,and the entrapment efficiency(EE%)was determined with the Sephadex gel chromatogram.The mean particle size,drug entrapmen...