Abstract: According to static load test on a beam-column connection by top and seat angles with stiffer and double web angles, it is analyzed that the stresses on the top and seat angles, stiffer, web angles, beam flange and web, column flange and web. The static behavior and failure mode of the sem-i rigid connection are determined, and the M-H relation, the initial stiffness, the ultimate bearing capacity and the ultimate rotation are obtained. The stiffeners and other factors which influence the static behavior of the connection are discussed.