Abstract: On the basis of analyzing stress state and simplifying structure of height-regulating structure of shearer’s cutting unit，mechanics model of height-regulating structure of cutting unit was set up.Applying Matlab/Simulink to setting up dynamic simulation model，height-regulating process was simulated.Results showed that increasing rigidity and damp of height-regulating oil-cylinder could reduce system vibration and improve system stability in height-regulating process，which provided reliable theoretical basis for designing height-regulating structure.