The　substation　truss　is　a　main　structure　in　the　power　transmission　system.　To　know　the　quality　status　of　existing　substation　truss　scientifically　in　time　is　important　for　structure　repairs　and　may　help　avoid　the　grave　engineering　accident,　ensure　the　security　of　power　transmission　system　and　reduce　possible　economic　losses.　Based　on　the　theory　of　fuzzy　synthetic　evaluation　and　reliability　analysis,　and　combined　with　internet　technology　and　reliability　analysis　of　structures,　the　structural　quality　management　system　of　substation　truss　using　internet　and　intranet　is　presented.　The　daily　management,　remote　analysis,　diagnosis　and　management　of　substation　truss＇s　quality　have　been　realized.　Through　the　application　in　some　220KV　substation,　the　main　process　and　steps　of　this　system　are　introduced　in　details.　And　its　practicability　has　been　verified.