Regulation of optical properties and electronic structure of graphitic carbon nitride (g-CaN4) via exteal strain has attracted much attention due to its potential in photocatalyst and electronic devices.However,the identification of g-C3N4 structure transformation induced by strain is greatly lacking.In this work,the Raman spectra of g-C3N4 with exteal strain are determined theoretically based on the density function theory.Deformation induced by exteal strain not only regulates the Raman mode positions but also leads to a Raman mode splitting,which can be ascribed to crystal symmetry destruction by strain engineering.Our results suggest the use of Raman scattering in structural identification in deformed g-C3N4 structure.