This　article　provides　a　simple　methodology　to　achieve　an　optimized　parameter　design　of　the　dual-loop　control　for　grid-forming　voltage　source　converters　(VSCs)　with　LC　filters.　The　optimized　parameter　design　is　conducted　for　the　current　inner　loop　and　voltage　outer　loop　independently　without　any　coupling,　and　the　design　processes　of　these　two　loops　are　exactly　the　same.　Moreover,　in　the　proposed　design,　standard　analysis　and　design　tools,　e.g.,　pole　map　and　Bode-plot　can　be　directly　employed　while　complex　formula　solving　is　needless.　Therefore,　this　methodology　is　easy　to　implement　for　a　practical　engineering.　In　addition,　contrary　to　common　sense,　it　has　been　identified　that　the　proportional　controller　in　the　outer　loop　has　a　negligible　impact　on　the　control　bandwidth　of　typical　medium　power　rating　VSCs　and　thus　can　be　eliminated　to　further　simplify　the　design　process　and　control　structure.　The　left　resonant　controller　can　then　be　refined　to　achieve　a　significantly　improved　dynamic　performance　of　the　output　voltage　of　VSCs.　Detailed　processes　and　considerations　of　the　proposed　design　methodology　are　introduced　and　analyzed.　Its　effectiveness　and　performance　are　carefully　verified　by　experimental　results　from　a　single-phase　scaled-down　VSC　prototype.