The integration of geological engineering is one of the key technologies for efficient development of tight oil, and plays a very important role in the development of tight oil in Chang 8 member of the lower Yanchang Formation in West Ganquan. However, the evaluation criteria for geological and engineering sweet spots have not yet been formed in this block, which restricts the deployment of future oil and gas exploration and development plans. Therefore, using logging data to identify reservoirs in Chang 8 member of the study area, the evaluation index system of geological sweet spot is formed in terms of source rock, diagenetic facies and reservoir distribution characteristics. From brittleness index, rock stress and strain test, rock tensile fracture test, the evaluation index of engineering sweet area is established. The results show that: (1) The identification accuracy of reservoir fluid properties of Chang 8 member in the study area can reach 90% by differential analysis and fluid sensitive parameter method; (2) An evaluation index of geological sweet spot area of tight oil reservoir is established based on sand thickness, reservoir thickness, sedimentary facies, porosity, diagenetic facies and TOC*H parameters; (3) On the basis of petrophysical experiments and actual construction results, the evaluation indexes of the sweet spot of Chang 8 tight reservoir engineering in the study area are established from the aspects of petrophysical parameters and the optimization of differentiated fine-cut volumetric fracturing process. Under the constraint of geological sweet spot and engineering sweet spot, the recovery rate of Class Ⅰ reservoir can be increased from 5.3% to 17.3%, Class Ⅱ reservoir can only be increased from 4.86% to 8.19%, and Class Ⅲ reservoir can only be increased from 2.81% to 4.95% by optimizing fracturing process parameters.