Abstract: This article presents an investigation on the earthquake damping effect by applying isolation bearing and buckling restrained brace to the steel tube arch truss system. By using SAP 2000 software and based on concentrated plastic hinge theory including geometric and material nonlinearity，many dynamic increment analyses of both original and damping structure systems were carried out under earthquake waves. Their dynamic performance including plastic hinge distribution，deformation，failure form and structure ductility coefficient obtained. Their dynamic performances were evaluated and compared. The results showed that the self-vibration period of the damping structure was extended; the critical failure limitation capability of damping structure was 131. 2% higher than the original structure，and its seismic performance was improved significantly; The failure types of both original structure and damping structure were elastic-plastic dynamic buckling; the quantity of plastic hinges for them were less before their failure，and their distributions of plastic hinges were uniform; They all had some ductility，their absolute deformation was small before failure，and their failure sign was not significant．