Corrosion　reduces　the　effective　cross-section,　leading　to　the　bearing　capacity　loss　of　marine　tubular　steel　structures;　the　structures＇　time-variant　performance　are　of　great　concern　in　practices.　The　paper　employs　random　field　simulation　to　account　for　corrosion＇s　spatial　variability　in　evaluating　the　bearing　capacity　of　the　axially-　loaded　steel　tubes,　and　proposes　a　time-variant　reliability　analysis　framework　for　marine　tubular　steel　structures,　from　the　member-level　to　the　structure-level.　Results　are　compared　with　those　neglecting　the　corrosion＇s　spatial　variability.　The　proposed　method　prevents　a　significant　underestimation　of　the　failure　probability　comparing　to　that　neglecting　spatial　variability,　and　provides　a　tool　for　designers　to　predict　the　time-variant　reliability　levels　for　marine　steel　structures.