Abstract: The model of 2JTP one rope winding mine hoist is established the 3 dimensional model with UG and the finite element model with ANSYS Workbench. Then, the first six natural frequencies and principal shapes are calculated in the modal analysis of main shaft device .And then the dangerous frequency range and the amplitude-frequency characteristic are determined through the harmonic response analysis.It also illustrates the limitations of harmonic response analysis.The results of analysis provide the basis for fault diagnosis and structural optimization design.