When conventional plugging agent is used for deep profile control and flooding in medium-low permeability reservoirs，there is a contradiction between injection and plugging ability，so the effect of profile control and flooding is poor. The retarded authigenic gas foam gel（RAGFG）system was developed by adding gas generating agent ammonium chloride and sodium nitrite， retarder，crosslinking agent chromium acetate and surfactant alkyl amide propyl betaine FM into polymer solution. The gas production performance，rheological properties，injectivity and plugging performance of the system were investigated，and the mechanism of the deep profile control and flooding of the system was discussed. The results showed that the gas production time of the RAGFG system could reach more than 155 h，and the gas production efficiency was 77.38%. Compared with the gel system， the obtained foam gel had higher apparent viscosity，yield stress and viscoelasticity. The injection pressure of the RAGFG system in the sand filling pipe with the permeability of 158×10^-3 μm² was only 0.12 MPa，the breakthrough pressure could reach up to 7.58 MPa，and the plugging rate was 99.0%. The double-tube parallel experiment with a permeability difference of 10 showed that the gas-liquid ratio of the RAGFG system was continuously increased during the migration process，and the viscoelasticity was gradually enhanced. Therefore，the RAGFG system had the characteristics of enhancing the plugging ability along the way. The diversion rates of sand-filled pipes with permeability of 1025×10^-3 and 92×10^-3 μm² could be changed from 95 % and 5% to 60% and 40%，respectively，and the plugging ability of the system to high permeability pipes declined little after 7 PV of subsequent water flooding. The visual oil displacement experiment confirmed that the RAGFG system could enhance oil recovery by 29.73 percentage points. Therefore，the RAGFG system had the characteristics of“slow gas production and foaming + delayed gel crosslinking + step-by-step enhanced plugging”，which is expected to be applied to medium-low permeability and high water cut reservoirs to enhance oil recovery.