Seven of circular hollow section column and H-shaped beams analysis models were established by ABAQUS. The main parameters include the beam flange thickness and width, the beam web thickness and height, the column thickness, the external diaphragm width and the thickness. The influence of the main parameters on the bearing capacity and the stiffness had been investigated. OpenSees program also been used in this paper to compare with the test results using the evaluating formula come from the finite element analysis results.