In　this　paper,　we　design　software　of　real-time　data　acquisition　to　meet　the　characteristics　and　demands　of　working　flow　of　Software　Defined　Radio　(SDR)　receiver.　The　software　is　designed　in　multi-thread　model,　which　can　guarantee　real-time　performance　and　efficiency　compared　to　single　thread　and　it　can　be　used　in　Windows　XP　to　analysis　intermediate　frequency　signal.　Besides,　efficient　memory　allocation　and　management　can　improve　stability　and　flexibility　of　the　software.