A　quadratic　polynomial　regression　equation　was　established　by　response　surface　method　to　optimize　the　mix　proportion　of　vinyl　chloride,　ethylene　and　ethylene　ether　ternary　polymer　mortar.　The　mechanism　was　analyzed　by　combining　the　macroscopic　property　and　microscopic　morphology.　The　results　show　that　the　model　can　accurately　predict　the　results　within　the　test　range,　and　the　response　surface　method　is　accurate　and　scientific　in　the　mix　proportion　optimization　of　ternary　polymer　mortar.　The　order　of　influence　factors　on　the　28　d　compressive　strength　is　water　to　cement　ratio,　water　reducer　content,　polymer　content.　While　that　on　28　d　flexural　strength　and　bonding　strength　is　polymer　content,　water　to　cement　ratio　and　water　reducer　content.　Taking　the　maximum　bonding　strength,　the　maximum　flexural　strength　and　the　minimum　compressive　strength　(the　maximum　flexuralcompressive　strength　ratio　)　as　the　target　optimization　values,　it　is　concluded　that　the　optimal　mix　proportion　of　ternary　polymer　mortar　is:　polymer　content　is　12%,　water　to　cement　ratio　is　0.42　and　water　reducer　content　is　1.12%.　©　2021,　Editorial　Department　of　Journal　of　Building　Materials.　All　right　reserved.