Manganese　copper　composited　algaecide　(MCC)　was　prepared　by　permanganate　and　acid-soluble　copper　chloride.　The　effectiveness　of　MCC　on　Microcystis　aeruginosa　removal　and　the　effective　period　of　MCC　were　studied,　pH　influence　on　the　water　sample　was　inspected,　and　the　feasibility　of　MCC　as　a　new　algaecide　was　discussed.　The　results　showed　that　inactivation　effect　on　Microcystis　aeruginosa　by　MCC　was　obvious.　Optimum　ratio　of　copper　reagent　A　and　manganese　reagents　B　was　0.5-1.5:I.　Removal　rate　of　turbidity,　OD420　and　chlorophyll　a　were　67.82%　77.98%　and　97.04%　respectively　during　10　days　of　MCC　dosing.　MCC　is　a　long　effective　period　algaecide.　Turbidity　and　chlorophyll　a　were　reduced　to　6.16NTU　and　1.048　mu　g　.　L-1,　with　removal　rate　of　77.4%　and　99.48%　after　MCC　dosing　of　16　days.　PH　value　of　water　samples　was　reduced　with　increased　ratio　of　copper　reagent　within　MCC.　When　composited　ratio　is　0.5-1.5:　1　pH　value　is　7-8.　This　study　laid　the　foundation　for　research　and　development　of　the　new　algaecide.