In order to investigate the demolding strength of secondary lining in single-line hard rock high-speed railway tunnels with different cross-sectional forms.The research focuses on secondary lining structures with and without an arch crown. The finite element method was adopted to analyze the stress characteristics of the secondary lining structure under demolding conditions， and a regression analysis of the safety factor for the structure was conducted under varying demolding strength conditions. Based on the findings， recommended demolding strength values are proposed. The results show that： （1）Under demolding conditions， the crown section of the secondary lining structure is the most critical， experiencing the maximum bending moment， minimal axial force， and the largest displacement， with the smallest safety factor in crack resistance checks； （2）Under the same demolding strength conditions， the safety factor for the secondary lining without an arch crown is higher than that for the structure with an arch crown. The recommended demolding strength for the secondary lining without an arch crown is 6 MPa， while for the structure with an arch crown， it is 10 MPa； （3）The tensile strength of the concrete material significantly influences the demolding strength of the secondary lining， especially in the 120° region at the crown， where the increasing of the material''s tensile strength can reduce the risk of early demolding cracks. The results of this study provide a theoretical basis and practical reference for optimizing the demolding time of secondary lining in high-speed railway tunnels.