Abstract: The inspection of the corrosion damage situation of steel pipe truss structure with ball-welded joints was launched, corrosion depth of steel pipe and corrosion distribution was captured .According to inspection results, the capacity of bars was so significantly reduced that met the demand of capacity. the repair plan of using section increment and replace bars was put , Unloading and construction supervision control was be used. The dynamic characteristic of prerestorative and postrestorative steel pipe truss structure was tested by dynamic testing ,to offer reliable foundations for the assessment of strengthening effect

Key words: belt corridor, steel corrosion, inspection, strengthening, dynamic characteristic