Abstract: Acrylated epoxidized soybean oil was synthesized from acrylic acid and epoxidized soybean oil. To investigate thermal properties,mechanical properties and Shore D hardness of acrylated epoxidized soybean oil modified bisphenol-A epoxy resin using triethylenetetramine as curing agent,fourier transform infrared spectroscopy (FTIR) ,differential scanning calorimetry (DSC) ,thermal gravity analysis (TG) ,mechanical propertie tests and shore D hardness testing were utilized. The results indicated that the enthalpy of acrylated epoxidized soybean oil (∆H=28.63 J/g) was far less than that of bisphenol-A epoxy resin (∆H=428.25 J/g) when both reacted with triethylenetetramine. With the content of acrylated epoxidized soybean oil in blends increased,the enthalpy,glass transition temperature,tensile strength,tensile modulus and hardness obviously decreased while peak curing temperature,impact strength and breaking elongation gradually increased. Moreover,modified biphenol-A epoxy resin gradually came into ductile fracture,which demonstrated that acrylated epoxidized soybean oil can toughen bisphenol-A epoxy resin.