The static and dynamic characteristics of the guides contact surface have a significant impact on the machine tool performance. Accurate contact surface parameters identification is the foundation of the machine tool performance prediction. Current domestic development method is not practical which leads to a restriction in development of machine and functional units manufacturing. Through the establishment of a dynamic mechanical roller linear guide model, the finite element method was used to analyze free and constraint modals of the guides which were then experimented on modal characteristics respectively. Results show that the difference between numerical simulation output and the experiment is within 8%. The finite element model of the roller linear guides has high precision, and can be used to predict characteristics of guides and machine tool.