Abstract: In order to get the actual system modality parameters of the gearbox on the continuous miner, the establishment of the experiment system was conducte d on the gathering and conveying gearbox on the continuous miner and there were 72 measuring points set on the gearbox.The polyMax experiment modality parameter distinguishing method was applied to obtain the actual status data of the gearbox under the dynamic conditions.With the modality experiment and theoretical analysis 0 n the gearbox, each stage modality parameter of the gearbox was distinguished and the structure variation condition of the gearbox and the shortage of each section de sign were provided which could provide the basis to the dynamic optimized design, manufacturing and maintenance of the gearbox.