Due　to　the　introduction　of　wireless　relays,　the　performance　of　LTE-A　system　was　enhanced.　Meanwhile,　more　energy　was　expensed　and　more　interference　was　brought　in.　This　is　because　the　frequency　used　by　relays　may　be　the　same　or　adjacent　with　the　other　relays　or　base　stations.　And　the　more　stations　deployed　in　a　cell,　the　more　energy　consumed.　In　this　paper,　we　proposed　a　novel　green　quasi-dynamic　frequency　resource　division　method　for　OFDMA　download　link.　This　method　is　suitable　for　the　situation　where　the　frequency　resources　are　not　continuous.　And　the　special　idle　resources　within　cell　are　quasi-dynamically　allocated,　according　to　the　load　situations　of　base　station　and　relays,　to　make　the　frequency　division　variable.　With　the　uniform　division　and　reasonable　allocation　based　on　the　distribution　of　stations,　the　co-channel　and　adjacent-channel　interference　can　be　decreased　effectively.　Moreover,　if　possible,　the　relay　stations　with　little　users＇　access　can　be　switched　off　and　these　users　will　be　served　by　the　adjacent　relays,　so　that　the　energy　consumption　can　be　reduced　further　and　some　interference　can　also　be　eliminated.