Abstract: A onedimension two phases flooding mathematical model is established to describe the viscoelastic heavy oil displacement，which considers the two factors of temperature and pectinbitumen content and is solved with numerical method.The effects of influencing factors and relaxation property on the displacement of viscoelastic heavy oil are analyzed.The results show that，the relaxation property gets weaker as the temperature and pectinbitumen bulk fraction content gets higher.The higher the temperature and the less the pectinbitumen content，the weaker the relaxation property is.The property will decrease the displacement pressure gradient and increase the water saturation，delay the water breakthrough time and prolong the production time，which is helpful to improve the development efficiency.However，its function will weaken as the increase of temperature or the decrease of the content.The research result provides theoretical guidance for the research of displacement characteristics and development efficiency of viscoelastic heavy oil.

Key words: viscoelastic property displacement characteristic