Abstract: In the development of edge and bottom water reservoirs, edge and bottom water intrusions always lead to vertical and plane contradictions. Nitrogen foam flooding, with the advantages of abundant gas source and low cost, is now the most common kind of foam flooding in field applications. Nitrogen foam injection to the oil wells with coned bottom water plays an obvious coning control effect. The injected water ripple of AT2 well block in the Tahe oilfield is small in size, and the water flooding efficiency is low. We used reservoir numerical simulation technology to carry out a feasibility study on nitrogen foam flooding to improve the development effect of the Triassic Yangchang oil group in AT2 well block in the Tahe oilfield.