Abstract: Aiming at the shortcomings of high formaldehyde content and low soaping and crocking fastnesses of currently used pigment printing binder,by60Co-γ radiation polymerization process,the waterborne polyacrylate(PA) emulsion containing active keto groups was synthesized from acrylate monomers and diacetone acrylamide(DAAM).Then ketone-hydrazide polyurethane-acrylate(PUA) hybrid emulsions were obtained by blending the adipic dihydrazides(ADH) groups-terminated PU emulsion and the PA emulsion according to a given proportion of DAAM and ADH.The mechanical properties and water-resisting properties of PUA hybrid emulsions were studied by means of FT-IR,etc.The colour fastness and environmental protection behavior of the pigment printing binder based on PUA hybrid emulsions were tested.The results showed that the PUA hybrid emulsions provides optimum properties when the contents of DAAM are around 1.30-1.40 percent,and the pigment printing binder is an environmental-friendly product free from formaldehyde and APEO.And the properties of the printed fabrics using the binder such as soaping and crocking fastnesses are excellent,and the formaldehyde content of the printed fabrics can meet the criteria of products for babies.