In　order　to　reasonably　and　quantitatively　assess　the　performance　of　the　train　communication　network　under　multi-factors　and　multi-services,　this　paper　chooses　the　network　time　delay,　bandwidth　and　packet　loss　rate　as　the　indicators　of　network　performance.　In　this　paper,　services　in　the　train　communication　network　have　been　divided　into　six　classes　according　to　their　characteristics　and　interoperability.　This　paper　proposes　utility　functions　model　to　describe　the　performance　of　each　selected　indicators　under　different　services　and　then　applies　the　model　to　evaluate　the　performance　of　each　service　and　the　train　communication　network.　Finally,　using　the　measured　data,　it　turns　out　that　utility　functions　can　be　effectively　used　to　evaluate　the　quality　of　services　and　the　performance　of　the　network.