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Cationic fluorinated acrylate latex was prepared via semi-continuous emulsion copolymerization of cationic monomer and other monomers.The resultant latex and its film were characterized with dynamic light scattering detector and contact angle meter.Influences of amount of DMDAAC on the properties of resultant latex and its film were investigated in detail.Results show that the particle size of the latex has the minimum value and the zeta potential of the latex is increased when the amount of DMDAAC is increased.In addition,the particle size of the latex is unimodal distribution when the amount of DMDAAC is not more than 2.5％.However,the particle size of the latex is bimodal distribution when the amount of DMDAAC is more than 2.5％.The contact angle is varied slightly with the increase of amount of DMDAAC when it is not more than 2.5％.Nevertheless,the contact angle is decreased with the increase of the amount of DMDAAC when it is more than 25％.