Metal diaphragms serve as key functional materials widely used in aerospace, microelectronics, chemical engineering, and other fields. As the core sensitive element in diaphragm pressure?reducing valves, their mechanical properties directly determine the valve's pressure regulating precision, stability, and service life. This paper systematically investigates the influence of key geometric parameters of the diaphragm and material properties on its mechanical performance under typical operating conditions. A mathematical model was established to analyze force distribution at the equilibrium position, where loads and constraints were applied, followed by the application of loads and constraints were applied, and the relationship between load and deflection was verified using the large deflection theory of corrugated diaphragms. A precise 3D parametric model of the diaphragm was built using SolidWorks software. The study employed the Finite Element Analysis (FEA) method, utilizing ANSYS software to conduct static structural simulation analysis on the diaphragm's geometric structure, parameters (width, height, thickness), and material properties. The results show that: the geometric structure of large arc corrugations is superior to sinusoidal corrugations; increasing the width of the outer corrugations increases the deformation, stress, and strain of the diaphragm, thus enhancing its sensitivity; increasing the corrugation height causes the diaphragm's elastic characteristics to first decrease and then increase; smaller diaphragm thickness results in better elastic characteristics; the elastic modulus of the diaphragm material is the dominant factor affecting its stiffness and deformation response?higher elastic modulus reduces deformation but increases stress, while materials with lower elastic modulus exhibit the opposite effect. Material selection requires balancing sensitivity, strength, and service life requirements. This research reveals the influence of the diaphragm's geometric structure, parameters, and material properties on its mechanical performance, providing an important theoretical basis and design guidance for the structural optimization design and high?performance material selection of diaphragms in diaphragm pressure?reducing valves.