Abstract: In this paper,based on the background of the research and development of disc-ring reactor which is used as final polycondensation in polyester industry, the power consumption of disc-ring reactor is investigated in three scale reactors with viscous fluid and viscoelastic fluid respectively. The effect of fluid elasticity on this reactors power consumption is obtained by comparing the power consumption of two fluids. Meanwhile the power consumption correlations of two fluids are given. The results show at: ①A grievous rod-crawling effect exists in this reactor with viscoelastic fluid and the effect depends on fluid elasticity, reactor diameter and rotational speed;②Power consumption is increased in elastic fluid and the degree of power increase depends on the diameter and structure of reactor, elasticity and rotational speed;③There is a critical value of elastic number and the effect of elasticity varies in different ranges of elastic number. These results can be used to calculate power consumption accurately for the design calculation of final polycondensation reactor.