Abstract: In order to solve the vibration problem of the rocker arm in the cutting process, taking MG500/1130-WD shearer as the research object, a method of vibration characteristic identification of the rocker arm based on strain mode was proposed.The Block Lanczos method was used to conduct modal analysis on the rocker arm housing, to obtain the first 10 natural frequencies of the rocker arm of the coal miner, and to analyze the 2-order modal resonance characteristics of the rocker arm housing and the transmission system.According to actual working condition of cutting,three - way cutting load and three - way cutting resistance moment of cutting drum are obtained by EDEM simulation, based on the ADAMS - EDEM - ANSYS joint simulation dynamics of the rocker, the rocker arm 2 order strain modal natural frequency is 63.98 Hz,built rocker arm strain data acquisition system,start experiments about the strain response of key section of rocker arm and anaylze the data in time and frequency domain. The results show that the error of the second order natural frequency of the rocker arm obtained by strain modal analysis and co-simulation is 0.52%, and the error of the modal analysis and experiment of the second order natural frequency of the rocker arm is less than 5%.The strain modal analysis method can effectively identify the low natural frequency and low frequency excitation of the shearer rocker arm and provide a new idea for the vibration research of shearer rocker arm.