In　the　current　study,　a　new　system　that　using　a　scroll　compressor　with　two　vapor　injection　holes　named　as　＇multi-vapor　injection　system＇　was　provided.　The　thermodynamic　model　to　analyze　the　system　has　been　set　up　and　the　calculation　program　is　designed.　The　two　suitable　middle　pressures　were　calculated,　and　the　recommended　empirical　formulas　are　provided　for　calculate　two　stage　middle　pressure.　Based　on　one　scroll　compressor,　the　method　of　how　to　make　injection　hole　was　developed.　The　calculation　results　demonstrate　that,　at　standard　operating　conditions,　the　cooling　capacity　of　new　system　with　multi-vapor　injection　can　be　about　3.8%　and　15.4%　higher　and　the　cooling　COP　can　be　about　2.8%　and　12.4%　higher　compared　with　that　of　the　one　hole　vapor　injection　system　and　normal　single　stage　system,　the　discharge　temperature　can　decrease　3°C∼4°C　under　heating　condition.