Vapor　compression　refrigeration　is　considered　as　ideal　miniature　cooling　system　for　miniature　electronic　systems　and　portable　cooling　systems.　Many　applications　of　the　miniature　refrigeration　system　are　working　under　the　situations　(such　as　aviation　field,　individual　combat　system　and　automobile　air　conditioning,　etc.)　that　exist　bump,　tilt,　and　even　flip,　which　will　severely　degrade　the　performance　of　the　miniature　refrigeration　system.　In　order　to　study　the　influence　of　compressor＇s　tilt　angle　on　refrigeration　system,　a　test　bench　was　built　and　the　performance　experiments　were　made.　The　results　show　that　the　compressor＇s　tilt　angle　has　a　great　impact　on　the　refrigeration　system　performance.　When　the　compressor　worked　at　the　maximum　tilt　angle　of　60A　degrees,　COP-c　and　COP-h　of　the　system　change　periodically.　When　the　compressor　works　in　full　load,　the　maximum　tilt　angle　for　compressor　is　20A　degrees.　When　the　compressor　tilt　angle　is　15A　degrees,　there　is　an　optimal　amount　of　refrigerant　charge,　and　corresponding　COP-c　and　COP-h　reach　the　maximum　of　2.9　and　3.9,　respectively.