In view of the problem that the production rules of conglomerate reservoirs with different modes in polymer/surface binary composite flooding stage have not fully been studied clearly，the residual oil distribution and pore production features of conglomerate reservoir at different stages of production were studied through indoor core oil displacement experiment combined with NMR online monitoring and CT scanning analysis. The results showed that the oil recovery of the single，dual and complex mode cores in the water drive stage was 31.4%，25.8% and 33.4%，respectively，while the enhanced oil recovery of the dual mode rock was higher than that of the complex mode rock and higher than that of the single mode rock in the binary composite flooding stage，which was 27.9，26.4 and 19 percentage points，respectively. Moreover，the pore limit of oil production was lower than that of the water production stage，and reduction amplitude of the complex mode core was higher than that of the single core and dual core. The heterogeneity of single，dual and complex mode cores was gradually enhanced，resulting in uniform displacement of single mode cores and high oil recovery in the water flooding stage. While the oil in complex mode rock was mainly concentrated at large hole with pore size of 32.7—52.5 μm，which was also largely produced in the water drive stage. In the dual modal conglomerate rock，the oil volume in the large pores was lower than that in the complex conglomerate rock，resulting in that the water flooding recovery rate was lower，and the remaining oil volume was higher. In the binary flooding stage，based on the effect of profile control and flooding and the influence of residual oil after water flooding，the dual mode core had the best effect of enhancing oil recovery，followed by the complex mode core.