This　paper　investigates　damping　solution　of　LLCL　filter　for　T-type　three-phase　three-level　grid　connected　inverters.　A　complete　design　process　of　LLCL　filter　with　three-level　topology　is　presented　and　the　potential　threat　of　inductive　grid　impedance　to　system　stability　is　analyzed.　The　active　damping　control　strategy　using　capacitor　current　feedback　in　stationary　frame　is　discussed　and　carefully　designed　in　the　discrete　domain.　The　simulations　are　conducted　in　PLECS　and　the　results　are　consistent　with　the　theoretical　analysis.　©　2020　IEEE.