The　initial　geometry　properties　about　resonant　orbits　in　the　Earth-Moon　system　are　investigated.　It　is　found　that　some　initial　geometry　properties,　such　as　eccentricity　and　initial　phase,　provided　by　two-body　theory　cannot　result　in　resonant　orbits　in　circular　restricted　three-body　problem　(i.e.　CRTBP)　due　to　the　gravitational　capture　of　the　Moon.　When　closest　point　of　a　resonant　orbit　is　in　the　Moon＇s　sphere　of　influence　(66200km)　or　the　Kepler　energy　to　the　Moon　is　nonpositive,　possible　flyby　or　weakly　capture　can　happen.　The　position　of　the　closest　points　to　Moon　and　the　Kepler　energy　distribution　with　variations　of　the　eccentricity　and　initial　phase　are　obtained,　and　the　range　of　eccentricity　and　initial　phase　that　cannot　result　in　resonant　orbits　in　CRTBP　are　also　given.　Examples　of　the　resonant　orbits　in　1:2,　1:3　and　1:4　exterior　resonances　and　2:1　interior　resonance　are　provided　to　verify　the　analysis,　it＇s　found　that　the　method　which　judging　the　closest　distance　between　spacecraft　and　Moon　is　more　accurate.　©　2018　KASHYAP.