Surfactant/Polymer (SP) combination flooding is an effective method to enhance oil recovery of high quality reserves,while its surface produced liquid treatment technology and the simplification and optimization of operating parameters are both still a challenge for the promotion of the chemical flooding technology industrialization.In this paper,the emulsification of SP combination flooding produced liquid is characterized by multi⁃factor perpendicular experiments,and then the effect factors of demulsification and dehydration are studied.Significant test results indicated that,compared with the temperature and water cut,the effect of the concentration of surfactant and polymer in the produced liquid on dispersivity and electronegativity of the bulk was lower,which showed the greater contribution to emulsification stability of produced liquid,thus the demulsification of the produced liquid was declined.Bottle test experiments indicated that a single mechanism of improving demulsification temperature or prolonging demulsification time couldn’t fundamentally improve the dehydration rate of the produced liquid and reduce the oil content in the water after separation,meanwhile,the improvement of the pH of the water phase and the strong shear effect of the flow field would further deteriorate the effect of demulsification,dehydration and the water quality after separation.