Abstract: With the random network technology,the study on res-ervoir micro-displacement has been made. By changing the model size distribution of pore and throat,and adjusting the proportion of pore wetting,the simulation of the oil displace-ment by water has been carried out,and the distribution net-work model of microscopic residual oil has been established.After each simulation,the residual oil saturation,micro-displacement efficiency,its frequency and content in pore ap-erture distribution could be calculated and analyzed. There-fore,the influencing factors of microscopic residue oil could be known. The research results indicate: the residue oil dis-tribution after water flooding is mainly affected by pore-throat ratio,pore size,wettability,initial oil saturation and displacement oil efficiency.