In　the　current　power　flow　calculation　for　radial　distribution　networks,　current　node　numbering　schemes　of　some　algorithms　are　relatively　complex.　So　they　aren＇t　suitable　for　changing　the　running　modes　of　radial　distribution　networks　and　the　implementation　of　procedure;　on　the　other　hand,　influences　of　storage　structure　on　power　flow　calculation　speed　for　radial　distribution　networks　aren＇t　taken　into　account.　To　overcome　these　shortcomings,　the　paper　proposes　a　node　numbering　scheme　and　a　method　that　transforms　nonlinear　storage　structure　into　linear　storage　structure.　At　last,　this　paper　brings　forward　a　mathematical　model　for　radial　distribution　networks,　and　proposes　a　novel　method　named　forward　sweeping　method　of　power　flow　calculation　for　radial　distribution　systems,　merits　has　been　shown　as　follows:　high　reliability　of　convergence,　high　speed　of　convergences,　little　iterative　time　every　time,　little　EMS　memory,　simpleness　of　programme　and　so　on.　Tests　show　that　it　is　a　practical　method　for　power　flow　calculation　for　radial　distribution　networks.