Coupled　with　gas-pressure　differential　equation　and　gas-state　equation,　a　Hagen-Poiseuille　formula-based　gas-charging　physical　model　of　the　hohlraum　is　established　by　Matlab.　Numerical　simulation　and　analysis　are　carried　out　on　the　helium　pressurization　in　the　inertial　confinement　nuclear　fusion　process.　The　results　show　that　the　continuous　fluid　model　in　the　helium　filling　process　can　meet　the　calculation　accuracy　requirements.　The　capillary　flow　capacity　has　great　influence　on　the　pressure　and　temperature　rise　in　the　hohlraum.　When　the　initial　temperature　of　helium　is　the　same,　as　the　capillary　flow　capacity　increases,　the　gas　filling　rate　is　increased.　Meanwhile,　the　gas　temperature　is　raised　in　the　hohlraum.　After　setting　the　cold-wall　variable　power　strategy,　as　the　maximum　cooling　power　of　the　cold　wall　increases,　the　filling　rate　and　the　temperature　in　the　hohlraum　are　decreased.　Once　the　maximum　cooling　power　of　the　cold　wall　goes　up　about　0.5　mW,　the　maximum　temperature　rise　in　the　hohlraum　is　decreased　by　13　K.　In　addition,　the　initial　temperature　of　helium　has　also　great　influence　on　the　filling　process,　namely,　as　the　initial　temperature　of　helium　is　decreased　by　1　K,　the　filling　time　will　be　decreased　by　about　0.6　s,　and　the　maximum　temperature　rise　in　the　hohlraum　is　decreased　by　about　0.1　K.　This　method　could　be　applied　to　the　fuel　gas　filling　of　the　capsule　and　intracavity　evacuation,　providing　an　effective　and　convenient　numerical　simulation　method　for　intracavity　gas　filling.　©　2019,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.