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Earthquake retrofitting insufficiency as well as architectural circumscription of ordinary X-braced techniques turns out to be controversial issue in engineering studies during last decades. Moreover removal of brace without deliberation of safety and structural stability is reasonably perilous and may lead to structural collapse. In this study an attempt has been made to implement rigid plates in beam columns connection to provide enough lateral resistance stiffness for structure against earthquake as shear frames to fulfill the architectural and the structural demand. The suggested connection includes of rigid plate which is welded to the flanges of column and beam to improve stiffness trait of beam-column joint. Rigid plate connection is appropriate in steel moment resistance frame that acts as supplementary gird element. By other words, ordinary beam column connection is strengthening by installation of stiffed rigid steel plate to beam and column flanges. In order to evaluate the seismic performance of structure with rigid plate in connections, the finite element simulation is made and push over analysis is performed. The results indicated that the rigid plate application in steel frame increases the failure capacity compare with bare frame. So it can be used as an alternative technique for rehabilitation of existing steel structures. Briefly the results demonstrate the seismic performance of steel structure equipped by rigid plate connection is improved.