A　thermodynamic　model　of　a　water-lubricated　single-screw　air　compressor　was　established　to　examine　the　impact　of　water　injection　parameters　on　performance.　Heat　transfer　and　leakage　between　humid　air　and　water　was　considered　by　analyzing　the　impacts　of　rotation　speed,　discharge　pressure,　the　rate　of　water　injection,　and　diameter　of　droplets　on　the　performance　of　a　compressor.　The　discharge　temperature　could　be　reduced　by　increasing　the　rate　of　water　injection,　resulting　in　the　compression　procedure　moving　towards　an　isothermal　state.　The　increase　in　the　rate　of　water　injection　under　rated　conditions　from　60　L/min　to　80　L/min　resulted　in　a　reduction　in　the　compressor　discharge　temperature,　increased　the　volume　efficiency,　and　increased　adiabatic　efficiency　by　11.1　K,　1.5　%,　and　2.8　%,　respectively.　Water　injection　atomization　increased　the　area　of　transfer　of　heat　between　humid　air　and　water　and　improved　the　performance　of　compressor.