In order to solve the problem of serious dust and difficult to control in coal conveyer belt without tissue in a thermal power plant of Shanxi, this paper introduces the principle of dry fog dust suppression technology, apparatus components, advantages and disadvantages and the application in a thermal power plant. Determination of dust concentration when the dry fog dust suppression work or does not work. Data show that the rate of dry fog dust suppression is generally greater than 80%, the dust concentration is less than 10 mg/m3, especially the suppression effect on small particles of less than 10 μm dust is obvious. Practice shows that dust has been effectively suppressed and it has a good application prospect, when this technology and device are applied.