The nonionic acrylic emulsion was prepared by 2-EHA and MMA with nonionic emulsifier as only emulsifier. The HLB value and dosage of nonionic emulsifier, ratio of oxide-reduction initiator, dosage of AM,glass transition temperature were tested. The results show that the best parameters of emulsion polymerization are as follows: the EO number of nonionic emulsifier is 35 EO, the dosage of nonionic emulsifier weight is 10% to monomer, the ratio of oxide-reduction initiator is 1.0∶1.1, the dosage of AM is 2% to total monomer weight,the glass transition temperature is about 25 ℃. Nonionic acrylic polymer emulsion is prepared with high performance at the above parameters.