Abstract: In order to study the harmonic disturbances occurred from the coal shearer in the fully mechanized coal mining face, according to the composition and th e speed regulation mode of the haulage system in the MG900/2210-WD electric haulage coal shearer, the MATLAB/SIMULINK software was applied to establish the si mulation model of the haulage model and a simulation experiment was conducted. The simulation results showed that under the rated speed, the current distortion of th e haulage motor would be serious, the second harmonic content would be rich and the voltage harmonics all would be distributed within the 2 kHz scope.The harmonic current occurred by the haulage system to the electric network would be 5, 7 and 11 times mainly and the amplitude would be 56.3, 21.3 and 7.9 A individually. The simu lation results showed that the harmonic occurred from the haulage system of the coal shearer would be serious, especially the low second harmonic.The harmonic at th e output side of the frequency conversion equipment in the haulage system would have less influence to the electric network and as for the electric power equipment joi ntly shared by the coal mining face and the coal shearer, certain measures should be taken to control the harmonic disturbances.