Abstract: Based on the study of jigging separation theory,obtained the ideal jigging water pulsating curve.Expand the ideal curve by using Fourier series,analyzed the first two phases which play a major role,got the relationship of frequency between main pulsation and auxiliary pulsation for compound-pulsation jig,the frequency of auxiliary pulsation is 2 times faster than main pulsation.In order to verify the conclusion,using sine cycle as an example,draws the superimposed waveform curve by Matlab to analyze,compared with not adding auxiliary pulsation,the displacement,velocity,acceleration of the superimposed waveform curve are both helpful for jigging process.The actual production in Daizhuang coal preparation plant in Shandong province show that the when frequency of auxiliary pulsation is 2 times of main pulsation,the amount of heavy material discharged through screen can be effectively controlled and the clean coal yield and quality-efficiency are increased.