The polymer microgels are a kind of agents, which has a role of improving reservoir heterogeneity and enhancing oil recovery. This new laboratory studies reported in this paper aimed at knowing how the polymer microgels propagate in porous media by artificial conglomerate cores experiments with multiple pressure measurement and the size distribution of microgels in yielding fluid. The results show that the maximum resistance factors are 5.3 and 8.5 respectively, while the polymer microgels propagate within the artificial conglomerate cores. There is only single peak, in which the highest peak is 5 μm in the yielding fluid of the core with permeability of 0.295 7 μm2. Furthermore, the double peaks appeared, in which the highest peaks are 7 and 150 μm respectively in the yielding fluid from the core with permeability of 0. 634 5 μm2. It is a good way on how to choose the size of polymer microgels in the field application of polymer microgels flooding.