To　make　full　use　of　coal　combustion　heat　energy,　and　for　the　purposes　of　energy　savings　and　pollutant　reductions,　more　than　two　different　coal　needs　to　optimize　the　preparation　of　coal.　This　article　describes　design　and　application　of　coal　blending　control　system　based　on　OLLiAS-LK　large-scale　PLC.　It　has　realized　the　functions　of　automatic　start　and　stop,　interlock　control,　material　level　adjustment,　speed　control　and　others　in　the　production　process,　improved　the　speed　of　the　blending,　realized　the　automation　of　the　blending　process,　and　reached　the　effects　of　the　accurate　ratio　and　homogeneous　optimization.　©　2010　IEEE.