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A self-emulsifying waterborne polyurethane dispersion was synthesized with both hexamethylene diisocyanate （HDI） trimer and toluene diisoeyanate （TDI）, polyether diols N220, 1,4- butanediol（BDO）, 2-hydroxymethyl-propionic acid（DMPA） and epoxy resin E-20 as main raw materials with acetone-based method. The dispersion was further modified by methyl methacrylate （MMA） to form a kind of nuclear-shell hybrid dispersion, in which the hydrophobic nuclear was the polymethyl methacrylate and the hydrophilic shell was the self-emulsifying waterborne polyurethane dispersion modified by HDI trimer.