A method of preparing a thin film, the method comprising: (a) mixing a lipid, emulsifier, and solvent to provide a uniform first mixture； (b) contacting an active ingredient with the uniform first mixture to provide a thickened second mixture； (c) contacting a binder with the thickened second mixture to provide a slurry； and (d) hot extruding, casting, and condensing the slurry to provide the thin film； or cooling, shearing, mixing, casting, and condensing the slurry to provide the thin film.
