Au-Cu　ore　from　Zijinshan　was　crushed　by　high　pressure　grinding　rolls　(HPGR)　and　jaw　crusher　(JC),　and　batch　grinding　test　of　the　product　crushed　by　different　crushing　processes　was　carried　out.　Grinding　speed　of　each　particle　size　of　the　products　crushed　by　HPGR　and　JC　was　analyzed　by　MATLAB　based　on　grinding　kinetics　principle.　The　micro-crack　of　the　products　was　analyzed　by　means　of　scanning　electron　microscope　(SEM),　and　distribution　characteristics　of　the　grinding　product　were　analyzed.　The　results　show　that　at　the　beginning　of　the　grinding,　micro-crack　mainly　affects　the　grinding　speed　of　the　products　crushed　by　HPGR　and　JC.　The　more　micro-crack　is,　the　faster　grinding　speed　is.　The　maximum　of　grinding　speed　of　the　products　crushed　by　HPGR　is　faster　than　that　by　JC　in　coarse　particle　size　(0.20-3.20　mm),　and　the　more　coarse　particle　size　mass　fraction　is,　and　the　larger　the　difference　of　the　amount　of　micro-crack　and　maximum　of　grinding　speed　is.　With　the　increase　of　grinding　time,　the　content　of　the　coarse　particle　and　micro-crack　becomes　less　and　less.　Grinding　probability　mainly　affects　the　grinding　speed,　leading　to　the　fact　that　the　grinding　speed　of　the　product　crushed　by　HPGR　is　equal　to　the　product　crushed　by　JC.　Pulverization　technology　of　HPGR　can　make　grinding　particle　size　distribution　more　uniform,　and　also　can　make　size　composition　more　optimal.　©　2017,　Central　South　University　Press.　All　right　reserved.