Air-cooling　systems　are　widely　used　in　coal-fired　power　plants,　especially　in　areas　rich　in　coal　resources　and　short　of　water.　To　prompt　its　economic　and　safe　operation,　dynamic　modeling　is　urgently　required　to　acquire　the　power　plant＇s　characteristics　under　complex　working　conditions.　In　particular,　the　condensing　pressure　of　the　air-cooling　unit　is　significantly　affected　by　the　ambient　temperature,　and　the　thermal　power　plant　is　a　complicated　energy　system　with　serious　nonlinearity.　In　many　cases,　it　is　difficult　to　establish　the　mathematical　model　of　the　system　by　traditional　analytical　methods.　In　the　present　work,　a　1000　MW　supercritical　power　plant　thermal　system　was　modeled　and　simulated　by　GSE　simulation　software.　The　model　was　developed　according　to　the　structural　characteristics,　incorporating　boiler　system,　steam　turbine　system　and　direct　air-cooling　system.　The　simulation　results　were　compared　with　the　actual　operation　data　of　the　power　plant　to　validate　the　model.　The　relative　errors　of　the　simulation　models　under　steady-state　conditions　were　less　than　3%,　which　indicates　that　the　models　have　high　accuracy.　On　this　basis,　the　influence　of　condensing　pressure　on　the　standard　coal　consumption　rate　was　obtained.　It　was　shown　that　when　the　condensing　pressure　ranged　between　5　kPa　and　20　kPa,　the　coal　rate　increased　by　1.6　g/kWh　with　1　kPa　increase　in　the　condensing　pressure.　Then　the　boundary　conditions　of　the　system　were　changed.　When　the　parameters　changed,　the　changes　of　condensing　pressure　and　power　were　monitored,　so　as　to　study　the　dynamic　characteristics　of　the　system.　©　ICOPE　2019　-　7th　International　Conference　on　Power　Engineering,　Proceedings.　All　rights　reserved.