Abstract: The formation and evolution of reservoirs in petroliferous basins are jointly controlled by tectonism and diagenesis. Quantitative evaluation of structural diagenesis is of great significance for deeply understanding the formation and evolution of reservoirs and reservoir quality. By analyzing the connotation of structural diagenesis and the main influencing factors for the formation and evolution of reservoir, this paper proposes that structural diagenetic strength can be used to quantitatively characterize the influence of tectonism and diagenesis on the formation and evolution of reservoirs and reservoir quality. Structural diagenetic strength refers to the degree of influence on tectonism and diagenesis during the formation and evolution of reservoir, which can be quantitatively characterized by the structural diagenetic index. The structural diagenetic strength can reflect not only the influence of time, depth, temperature, pressure and other controlling factors for the diagenetic evolution occurred during burial process on the reservoir, but also the impact of tectonic deformation intensity and its evolution in different structural periods on the reservoir. Quantitative evaluation of the structural diagenetic strength of the deep Cretaceous tight sandstone reservoirs in Kuqa foreland basin shows that the formation and evolution of reservoir is closely related to the structural diagenetic strength. As the structural diagenetic strength increases, the pore volume of reservoir matrix decreases and the development degree of natural fractures increases. From the piedmont structural belt to the frontal uplift belt of Kuqa foreland basin, the structural diagenetic strength successively increases from large to small; the matrix porosity of reservoir gradually increases, while the development degree of natural fractures gradually decreases. The quantitative evaluation method of structural diagenetic strength can provide a new way for the quantitative evaluation and prediction of deep tight sandstone reservoirs.