Abstract: Effects of oil-water ratio，polymers，surfactants and natural solid particles on wastewater emulsification were studied by simulating oilfield produced liquid． With the decline of oil-water ratio，the oil content of water was reduced，Zeta potential of oil beads was increased and the average particle size became larger，then watery emulsion stability was weakened． HPAM was adsorbed on the surface of oil droplets，which enhanced oil droplets electronegativity and reduced the effective collision probability between oil droplets，so the average particle size of oil droplets became smaller and oil water separation became difficult． The surface tension of water samples was reduced by surfactants and oil-water affinity was enhanced，which resulted in the fact that the oil contents were increased，oil droplets electronegativity was enhanced and oil droplets coalescence became more difficult． For the electronegative of natural solid particles，the Zeta potential of the oil droplet was reduced and electronegativity was enhanced，which against oil droplets coalescence，resulting in increased oil content and more stable emulsion．