The　effective　transfer　of　software　requirement　knowledge　is　one　of　the　key　factors　of　decreasing　the　requirements　volatility,　solving　conflicts　between　requirements,　ensuring　the　quality　of　software　project　and　customer　satisfaction.　From　the　point　of　knowledge　management,　this　paper　first　classifies　the　software　project　requirement　knowledge　into　4　categories　according　to　the　knowledge　sources　from　which　software　project　development　team　acquires　requirements.　Then　constructs　the　knowledge　transferring　model　of　requirement　development　and　requirement　management　in　software　projects,　and　analyzes　the　major　influencing　factors　during　the　requirement　knowledge　transferring　process.　At　last　the　strategies　that　can　promote　the　requirement　knowledge　transfer　effectively　are　proposed.　©2010　IEEE.