Because　of　the　characteristics　of　energy　conservation　and　environmental　protection,　energy　saving　LED　lamps　are　used　in　different　lighting　places.　This　paper　promotes　the　development　of　LED　dimming　technology.　This　thesis　proposes　a　multi-channel　digital　PWM　dimming　system　based　on　OC8051　soft-core　for　the　application　requirements.　The　soft-core　of　OC8051　is　optimized,　a　multi-channel　digital　PWM　controller,　signal　decoding　unit　and　driving　circuit　are　designed　and　implemented　on　FPGA.　The　system　core　uses　a　clock　of　16MHz,　supports　dimming　range　from　0%-100%,　supports　four　PWM　signal　output,　and　the　frequency　can　reach　61Hz-8MHz.　The　digital　PWM　dimming　system　works　stably　and　can　be　used　to　adjust　the　brightness　and　color　of　LED.　©　2021　IEEE.