High-speed　single-grain　grinding　tests　were　carried　out　for　45　steel,　20Cr　alloy.　The　grooves＇　morphology　and　area　removal　ratio,　chip　morphology,　grinding　force　ratio,　and　specific　grinding　force　are　studied.　The　area　removal　rate　η　increases　with　the　grinding　section　area　increasing.　The　plowing　decreases　with　the　grinding　section　area　and　grinding　speed　increase.　Surface　integrity　can　be　improved　under　high　speed　and　deep　grinding.