During the recovery of high heterogeneity oil reservoir, polymer gel profile control technology has been used widely, but the existing polymer plugging system can’t seal the large pore channels effectively due to salt sensitivity effect and high temperature degradation. The gel system (konjac powder 5.0 g/L, polyacrylamide 2.0 g/L, phenol 3.5 g/L, formaldehyde solution 10.0 g/L, sodium humus 2.5 g/L) was prepared from konjac powder as the main raw material. The gel viscosity is still good after be heated at 90~120℃. The gel is salt tolerance to NaCl, MgCl2 and CaCl2. Water released quantity of the gel is below 10% after being heated at 120℃ for 20d, which shows the gel system has good anti-aging performance. Through indoor steam drive double-tube parallel experiment, we can know that the flow rate of driving fluid increased significantly in low permeability sand pack and the oil recovery increased 16.6% after plugging by 0.5 PV gel, which indicates that the gel system can block the large pores area in reservoir effectively.