In　order　to　figure　out　the　genesis　and　the　model　of　eastern　Liaoning　borate　deposits,　the　four　main　controlling　factors　including　boron-bearing　rock　system,　magnesian　host　rocks,　regional　metamorphism　and　migmatitization,　and　tectonism　are　studied.　It　reveals　that　the　boron-bearing　rock　system　is　rich　in　boron,　the　host　rocks　of　the　borate　deposits　in　magnesium　and　is　the　precipitator　for　boron;　besides,　the　boron　of　the　boron-bearing　rock　system　has　gotten　more　active　and　a　lot　of　boron-bearing　fluid　formed　in　the　course　of　the　regional　metamorphism　and　migmatitization　of　the　boron-bearing　rock　system;　while　the　magnesium　borate　deposits　have　formed　in　the　metasomatism　of　the　boron-bearing　fluid　with　magnesian　hosting　rocks　in　favorable　structural　space.　Thus,　the　boron-bearing　rock　system　and　the　magnesian　rocks　are　the　foundation　of　the　borate　deposits,　whereas　regional　metamorphism　and　migmatitization　and　tectonism　are　the　necessary　conditions.　Ore-forming　model　of　eastern　Liaoning　borate　deposits　is　the　primary　enrichment　of　the　eovolcanic　sediment　and　the　metamorphic　hydrothermal　replacement　between　some　boron-bearing　fluid　and　the　magnesian　rocks　during　the　process　of　regional　metamorphism　and　migmatitization　and　tectonism.