Abstract: According to the existing problems of dust control at fully-mechanized working face, we analyzed the laws of dust migration in coal cutting by coal cutter. A new dust control system with foam at fully-mechanized working face was proposed, including positive pressure proportioner, foam maker, bubble distributor and nozzle and so on. And then it is tested at 22186 fully-mechanized working face in Shanjiaoshu Mine. The results indicate that collection efficiencies of total dust and respirable dust with foam is up to 75.16% and 63.86% respectively, which are 1.72 times and 1.61 times as the water spray did, and greatly increase dust removal effect at fully mechanized working face.