In　the　production　process　of　copper　alloy　metal　mold　casting,　the　surface　of　the　mold　cavity　must　bear　the　effects　of　erosion　wear　and　thermal　stress　of　high-temperature　liquid　metal,　resulting　in　fatigue　cracks　and　erosion　corrosion　on　the　mold　surface,　which　seriously　affects　the　service　life　of　the　mold.　To　address　the　problems　of　short　mold　life　and　poor　surface　quality　of　castings　in　the　casting　process　of　copper　alloy　water-meter　shell,　a　new　type　of　mold　surface　treatment　coating　was　developed.　The　effects　of　refractory　filler,　suspending　agent　and　binder　on　the　properties　of　suspensibility,　viscosity,　adhesion,　wear　resistance,　drying　crack　resistance　and　demolding　performance　of　the　coating　were　studied　by　single　factor　and　orthogonal　test.　The　formula　of　water　meter-shell　copper　mold　coating　was　optimized　and　verified　in　the　production　practice.　The　results　show　that　when　talc　powder　is　55wt%,　mica　powder　is　30wt%,　boron　nitride　is　15　wt%,　sodium　bentonite　is　6wt%,　sodium　carboxymethyl　cellulose　is　0.5wt%,　sodium　silicate　is　10wt%,　sodium　hexametaphosphate　is　1.2wt%,　and　solid-to-liquid　ratio　is　1:2,　the　coating　has　high　bonding　strength　with　the　mold　surface,　and　the　coating　does　not　fall　off,　which　can　better　protect　the　mold　surface　from　the　erosion　and　wear　of　the　alloy　melt,　and　effectively　improve　the　service　life　of　the　mold　and　the　quality　of　the　casting.