Municipal　solid　waste　incineration　(MSWI)　process　is　complex　physical　and　chemical　reactions　with　strong　coupling　and　nonlinear　characteristics.　In　addition　to　the　main　operating　factors　such　as　combustion　airflow　and　waste　feeding　speed,　the　combustion　status　of　solid　waste　is　also　affected　by　many　other　parameters,　such　as　composition,　micro,　and　reaction.　In　this　article,　the　numerical　modeling　and　sensitivity　analysis　of　solid　phase　combustion　in　the　grate　based　on　benchmark　operational　condition　is　carried　out　for　a　MSWI　power　plant　in　Beijing.　First,　the　mechanism　of　solid　phase　combustion　in　the　grate　of　a　MSWI　process　is　analyzed.　Then,　the　benchmark　condition　of　the　incineration　plant　is　determined,　that　is,　the　values　of　common　operating　variables　(feeding,　primary　airflow,　secondary　airflow,　and　grate　speed)　used　in　the　actual　MSWI　plant.　Finally,　the　influence　of　parameters　on　the　MSWI　process　is　analyzed　based　on　the　benchmark　condition.　©　2023　IEEE.