A series of aqueous blocked sel-f crosslinking hybrid polyurethane-acrylate ( PUA ) emu lsions has been synthesized in three steps: ( 1) synthesis of hydroxyl term inated PUA prepolymers by soap-free emulsion polym erization; ( 2) preparation of water-dispersib lemethylethyl ketoxime (MEKO ) and E-caprolactam blocked crosslinkers from to luene diisocyanate( TDI) , trihydricalcoho ls and DMPA; ( 3) a series of aqueous blocked sel-f crosslinking PUA emulsions are synthesized by mixing the resulted products ( 1) and( 2) at different ratio. The film s can be obtained from the emulsions by post-curing at h igh tempera tures.The emu lsions were characterized by differential scanning calorime try( DSC ) and thermogravimetric( TGA )analysis, and themechanical properties of the films have also been studied.