STRUCTURAL DESIGN BASED ON DIFFERENT PERFORMANCE LEVELS AND EARTHQUAKE HAZARD LEVEL OF A SELECTED REGION, DEPENDS ON STIFFNESS DUCTILITY AND ENERGY DISSIPATION SIMULTANEOUSLY (1). THIS STUDY INTRODUCES A NEW SEISMIC RESISTANT SYSTEM THAT CALLED KNEE-RING BRACED frame, IS SATISFY THE ABOVE REQUIREMENTS, SO THAT WHEN THE EARTHQUAKE OCCUR, THE NON-MAIN STRUCTURAL ELEMENT LIKE KNEE-RING EXPERIENCE NON-ELASTIC DEFORMATION AND MAIN STRUCTURAL MEMBERS STAY IN ELASTIC REGION, AFTER EARTHQUAKE, NON-MAIN STRUCTURAL ELEMENT THAT IS LIKE SESMIC FUSE, REPLACEING AND STRUCTURE REDY TO OCCUPANCY. NON-ELASTIC STIFFENESS OF frame DEPENDS ON NON-ELASTIC STIFFENESS OF KNEE-RING ELEMENT AND BENDING STIFFNESS OF RING ELEMENT DEPENDS ON RING DIAMETER. SO THAT COMPARE AMOUNT OF STIFFNESS AND ENERGY DISIPATION OF frame BY CHANGE KNEE LENGTH AND RING DIAMETER WITH ANALYSIS SEVRAL frame VIA FINITE ELEMENT METHOD. FINALLY, RESULTS OF COMPARE HYSTERESIS CURVES, STIFFENESS AND ENERGY DISIPATION OF EACH LOADING CYCLE, INDICATE 1- STIFFNESS OF frame DEPENDS ON KNEE LENGTH OF frame SO THAT ADDING RING ELEMENT ESPECIALLY SET THE HYSTERESIS CURVES, REGULAR AT THE THREE END OF THE LOADING CYCLE. 2- ADDING RING ELEMENT TO frame ARE INCREASED ENERGY DISSIPATION SO THAT AMOUNT OF ENERGY DISIPATION RELATED TO DIAMETER OF RING ELEMENT. 3- DESIGN STRUCTURES BASED ON DIFFERENT PERFORMANCE LEVELS AND EARTHQUAKE HAZARD LEVEL OF A SELECTED REGION, SHOULD CHANGE STIFFENESS OF frame BY CHANGING KNEE LENGTH AS WELL AS CHANGE ENERGY DISSIPATION OF frame BY CHANGING DIAMETER OF RING ELEMENT. DESIRABLE DESIGN OF STRUCTURES BASED ON DIFFERENT PERFORMANCE LEVELS AND EARTHQUAKE HAZARD LEVEL OF A SELECTED REGION,IS DONE WHEN CHOOSING SUITABLE KNEE LENGTH TO RICH APPROPRIATE STIFFNESS OF frame AS WELL AS WHEN CHOOSING SUITABLE DIAMETER OF RING ELEMENT TO RICH APPROPRIATE ENERGY DISSIPATION OF frame.