Abstract: Experimental flowsheet and system are established for microscopic displacement experiment with microgel,and in-jection and displacement methods are discussed.Prelimi-nary knowledge of oil -driving features of microgel and quantitative analysis are achieved through80microscopic displacement experiments of microgel under different con-ditions.The main oil-displacing modes are creeping-elon-gating-carrying-displacing;common channel of oil,water and gel is the principle seepage flow channel;the flow fea-tures in pore throats are deformational creeping;and the residual oil after displacement show beaded distribution.Mi-croscopic quantitatively analysis results show that oil-displac-ing effects of microgel are the best after waterflooding.