The laying dust mechanism of the spreading cyclone separators with electrostatic precipitator is presented. The carry electricity process of the dust is described. The paper studies acting force and movement law of the carrying electricity dust

and sets up hydromechanics equation of the air dust. The driving velocity of the air dust is calculated and the influence of different resistance factor on the driving velocity is discussed. Finally

examples are given as to where spreading cyclone separators with electrostatic precipitator are used to slove industrial laying the dust.