The　transformerless　PV　inverter　system　would　cause　higher　ground　leakage　current　between　PV　inverter　and　the　ground.　The　conventional　solution　to　reduce　the　leakage　current　is　based　on　the　topology　and　complexity　control　methods.　This　paper　analyzes　the　reason　and　some　solutions　to　control　of　ground　leakage　current　at　first.　An　innovative　method　is　proposed　based　on　the　coupling　inductor　to　reduce　ground　leakage　current.　It　increased　a　coupling　coil　in　the　inverter　choke,　and　constituted　a　compensated-loop　with　capacitor,　to　decrease　ground　leakage　current.　The　result　shows　this　method　solves　the　ground　leakage　current　effectively　in　transformerless　PV　inverter　system　based　on　the　theoretical　analysis,　circuit　simulation　and　experimental　verification.　©　2020,　Harbin　University　of　Science　and　Technology　Publication.　All　right　reserved.