Abstract: Polymer separate injection especially three - layer separate injection,can improve the major problem of large difference in reservoir interlayer.With new polymer three - layer separate injection technology,polymer injection allocator are laid on the ground,then carry on salvage and preparation, connect each injection allocator to the electromagnetic flow meter,real- time monitor each layer injection quantity,the data is real and accurate,which avoided the problem existed previously.In this article,the principle composition,main necessary tool and field application of new polymer separate injection technology has been analysed.This technology has applied 20 well-times in the Henan oil field,the success ratio is 95%,and have made the good application progress.