Abstract: This paper introduces the principle of variable frequency speed regulation, summarizes its functions, performance, and reliability, and describes its practical application in explosion-proof winches in coal mines. The results show that the variable frequency speed regulation system has good application prospects and significant economic benefits. Keywords : Variable frequency speed regulation; frequency converter; frequency; principle; application WANG Hong—iun (Reniou Cog Mine ofWanbei Mirli-ngo, Industry Group Comp, Hj【-la ei 235123, China}[/align][/b] Abstract: Introducing the principle that frequency conversion adjusts the speed, sumlTlarize function, performance and dependability that frequency conversion adjusts the speed, and frequency conversion adjusts and fits rapidly in the practical application of the anti-blast hoist in the pit of the colliery． Result showed frequency conversion system application development prospects are very good and significant economic benefits．