To　further　study　the　influencing　factors　of　the　performance　of　water　lubricated　single-screw　air　compressor,　a　water　lubricated　single-screw　air　compressor　was　designed　and　manufactured,　and　an　experimental　system　was　set　up　to　investigate　the　effects　of　rotation　speed,　discharge　pressure　and　water　injection　flow　rate　on　the　performance　of　the　water　lubricated　single-screw　air　compressor.　Results　show　that　increasing　the　rotation　speed　can　reduce　the　leakage　and　improve　the　performance　of　the　compressor.　When　other　working　conditions　remain　unchanged　and　the　water　injection　flow　rate　is　increased,　the　water-gas　ratio　of　the　compressor　can　be　improved,　and　the　heat　exchange　between　water　and　gas　and　the　sealing　effect　of　the　compressor　can　be　enhanced,　so　as　to　improve　the　performance　of　the　water-lubricated　single　screw　air　compressor.　When　the　rotation　speed　is　3000　r/min　and　the　discharge　pressure　is　0.50　MPa,　the　increase　in　the　water　injection　flow　rate　from　50　L/min　to　80　L/min　reduces　the　specific　power　of　the　compressor,　improves　the　volume　efficiency,　and　improves　the　adiabatic　efficiency　by　0.26　kW/(m3·min　-　1　),　5.15%,　and　2%,　respectively.　Since　the　viscosity　of　water　is　much　less　than　that　of　lubricated　oil,　the　water-gas　ratio　is　higher　than　that　of　oil-gas　in　the　same　working　condition　in　order　to　ensure　the　performance　of　the　compressor.　Based　on　the　research　in　this　paper,　when　the　discharge　pressure　is　in　the　range　of　0.50　MPa　-　0.65　MPa　at　the　rated　rotation　speed　of　3000　r/min,　the　recommended　water-gas　ratio　range　is　2.94%-3.48%.　©　2023　Beijing　University　of　Technology.　All　rights　reserved.