Standing stability,centrifugal stability and thermal stability were tested to evaluate emulsifying property of Polyglycerol Caprate when the oil/water ratio was 1:1.The antimicrobial activity of Polyglycerol Caprate against food spoilage and foodborne pathogens were tested by the agar diffusion method and tube double dilution method.The results showed that;the type of emulsion is Oil in Water(O/W) and the emulsion has the best indexes of emulsifying property when the amount of Polyglycerol Caprate was 4%.Antibacterial experiment indicated that Polyglycerol Caprate presented significant antimicrobial activity against the indicator fungi and bacteria.The minimum inhibition concentration (MIC) of Polyglycerol Caprate against fungi and bacteria are as follow;A.niger 0.16 mg/mL,S.cerevisae 0.16 mg/ mL,S.aureus 0.32 mg/mL,E.coil 2.5mg/mL and B.subtilis 2.5 mg/mL.