The performance of two kinds of functional polymers were evaluated by lab experiments. Furthermore, relationship between viscosity and concentration, viscosity stability, flow characteristics of two kinds of functional polymers are studied. The results show that two functional polymers have a higher viscosity at different concentrations. The viscosity of functional polymer increases with the time. Flow characteristics show that functional polymers have a higher drag coefficient and residual resistance factor. Meanwhile, we conducted displacement efficiency experiments and expand swept volume experiments. The studies show that two kinds of functional polymer provide significant improvement in displacement efficiency, and after conventional polymer flooding, it also can expand swept volume of low permeability layers effectively.