Large　space　circular　coal　storage　dome　(LSCCSD)　offers　an　environmental　and　dependable　alternative　to　open　stockpiles,　and　it　has　been　consequently　widely　applied　in　China.　However,　due　to　the　lack　of　scientific　guidelines,　its　natural　ventilation　performance　is　lower　than　expected.　Natural　ventilation　potential　strongly　depends　on　the　roof　geometry　and　opening　mode,　which　have　not　yet　been　investigated　for　LSCCSD.　This　paper　presents　a　detailed　evaluation　of　the　impact　of　dome　geometry　(rise　span　ratio),　opening　height,　and　opening　modes　on　the　ventilation　performance　of　LSCCSD.　The　evaluation　is　based　on　computational　fluid　dynamics　(CFD)　methods　and　is　validated　by　available　wind　tunnel　testing.　We　employed　three　evaluation　indicators,　which　are　wind　pressure　coefficient,　effective　ventilation　rate,　and　wind　speed　ratio.　The　results　demonstrate　that　the　rise　span　ratio　has　a　significant　effect　on　the　wind　pressure　difference　and　the　effective　ventilation　rate　increases　by　approximately　9%-42%　with　a　single-annular　opening.　When　double-annular　openings　are　set　in　a　strong　positive　pressure　zone,　the　effective　ventilation　rate　increases　by　100%　and　the　average　wind　speed　ratio　increases　by　50%.　When　it　is　compared　with　single　one　with　similar　opening　height,　the　effective　ventilation　rate　increases　by　25%.　The　optimum　natural　ventilation　performance　for　LSCCSD　is　achieved　at　a　rise　span　ratio　of　0.37.　In　addition,　the　lateral　middle　opening　is　kept　higher　than　the　ridge　top　of　the　coal　pile.　The　proposed　evaluation　approach　and　design　parameters　provided　instructive　information　in　the　building　design　and　ventilation　control　for　LSCCSDs.