The　Quasi-Z　source　inverter　was　a　newly　proposed　circuit　topology　in　recent　years,　which　was　developed　from　Z　source　inverter.　Due　to　the　so　many　advantages,　It　has　important　research　value　and　broad　application　prospects　in　the　renewable　Energy　field　of　PV　and　fuel　cell.　The　circuit　strategy　and　feature　is　analyzed　in　this　paper.　This　paper　also　focus　on　the　novel　circuit　topology,　control　strategy　and　modeling　of　this　inverter.　A　simulation　example　was　given　to　verify　the　above　analysis.