Abstract: With the spindle system of M8400A type roll grinding machine as the object of the research. On the basis of the establishment of the three-dimensional solid model of the roll grinder grinding head spindle system, carry out finite element static analysis, with the spindle structural stress and strain diagram, study its static characteristics, carry out modal analysis in the properly simplified spindle system with the finite element method, analyze the calculated natural frequency value, study dynamic characteristics of the spindle system, lay the foundation for the realization of the dynamic design of product.