The process conditions of oxidation modify of paraffin waxes without using catalysts were investigated.Influences of air flow rate , mass fraction of oxidation initiating agent , reaction temperature and reaction time on the oxidation process and properties of paraffin w axes were studied.The results show that under proper conditions without using catalysts, the oxidized product with better tint, less smell and high acid number are obtained.Reaction temperature and reaction time are important factors, which affect oxidation process of paraffin waxes and proper ties of oxidized paraffin waxes.The optimal oxidation rate would be obtained when reaction temperature is at 150 ～ 155 ℃, optimal reaction time is 6 ～ 8 hours.In the oxidation absence of catalyst , there is no necessary to purify the oxidized product and its quality is stable .Oxidized paraffin waxes obtained from this process can satisfy the formula of many special waxes , especially using them to prepare emulsifying wax , the appearance , viscosity and stability of emulsion is good .