Abstract: CO₂ foam fracturing is an effective measure to improve the development result of tight sandstone gas reservoir. The central part of Su X block in Sulige Gasfield is a major replacement area for stable gas production in the near future. Compared with the main production area in the northern part, it is characterized by poor reservoir continuity and physical properties, high saturation of movable water, leading to severe water lock damage of gas wells when using conventional water-based fracturing, and increasing difficulty in fracturing fluid flowback. By taking Well Su X-A3 as an example, the concept of geology and engineering integrated CO₂ foam fracturing is innovatively practiced.Firstly, the integration of geological modeling and numerical simulation is applied to analyze the production characteristic parameters such as reservoir physical properties, gas-bearing property and movable water distribution, so as to optimally select well location and perforation interval to avoid formation water damage; Secondly, the geology and fracturing integration is applied to analyze the matching between reservoir physical properties and fracturing technology, so as to optimize the fracturing fluid system, fracturing size and pumping program; Finally, by using the flowback, well test, and gas production data, the evaluation and correction integration is applied to assess the fracturing results and technological adaptability, correct the pre-fracturing geological model, and complete the closed loop of geology and engineering integration technology. The study results show that the application of the geology and engineering integration in the optimization design of CO₂ foam fracturing enables to more comprehensively and accurately understand the reservoir quality and production performance, improve the pertinence of CO₂ foam fracturing design, and provide guarantee for a better result by using CO₂ foam fracturing. Field practice shows that this method is more in line with the practical needs than the previous conventional water-based fracturing design.