Theneutralgaspressureinpertorchamberisaverybasicandimportantphysicsparameterbecauseitdeterminesthetemperatureofchargedparticles,thethermalfluxdensityontopertorplates,theerosionofpertorplates,impurityretainingandexhausting,particletransportationandconfinementperformanceofplasmaintokamaks.Therefore,thepressuremeasurementinpertorchamberistakenintoaccountinmanylargetokamaks.