The development effect of polymer flooding composite well network adjustment technology is studied through physics experiment simulation, and the development effect of oil displacement and the distribution of remaining oil are analyzed from macroscopic and microscopic aspects. The micro⁃electrode technology was applied to the macroscopic physics experiment to study the development effect and residual oil distribution of the polymer flooding composite well network adjustment technology. The microscopic physics experiment applied nuclear magnetic resonance technology to study the microscopic distribution of residual oil in the high and low permeability core pores before and after polymer flooding. The experimental results show that by changing the injection⁃production well network system during polymer flooding, on the one hand, it can effectively improve the unevenness of the displacement and expand the swept volume. On the other hand, it can improve the profile, increase the macropore production in the middle and low permeability layers during subsequent water flooding. At the same time, due to the reduction of the injection⁃production well spacing after the adjustment of the well pattern, it is possible to increase the oil production while reducing the injection amount. After the end of the displacement, the remaining oil is mainly distributed in the areas where the middle and low permeability layers are not affected, as well as the small pores in the low permeability layer.