The basic properties of the produced water at each ternary station were initially obtained, through the analysis of the water quality, oil contentsettling time relationship and the characteristics of the produced water-time relationship of Zhong-106 ternary composite flooding in Daqing Oilfield. The ternary produced water contains a large amount of crude oil, suspended solids, oil displacing agents and the like. Due to the synergistic effect of the components, the pH value, particle size, viscosity and surface tension of the produced water remained basically unchanged after 72 hours of sedimentation, indicating that the properties of the produced water were relatively stable and the treatment difficulty was increased.