Abstarct: Today, one of the common structural systems in the country is reinforced concrete moment frxame. The load-bearing members in this structural system are designed for a lower level of seismic forces due to their high behavior coefficient and suitable plasticity. Often, in the design of structures with a reinforced concrete moment frxame system, the stiffness criterion prevails. One of the main existing challenges, considering the large volume of this structural system, which was created in the years before the development of seismic standards, is the plan to strengthen and improve these frxames. It is very desirable to provide improvement methods that can improve the performance of existing reinforced concrete moment frxames with the lowest level of destruction, by increasing the stiffness of the building and without significant changes in resistance. For the relative separation of drift and resistance criteria, the proposed system of this research is the system of lixnked beams frxame. The lixnked beams frxame system is a seismic load-bearing resistant system that has a high ability to absorb and dissipate energy. In this regard, OpenSees software has been used for verification with laboratory samples, modeling and nonlinear analysis of 8 samples of 5 and 10-story frxames with intermediate and special moment resisting frxame systems, which has the problem of not responding to the lateral displacement criterion of 20 percentage and improved these 4 frxames with lixnked beams have been used. The results of this research showed that in reinforced concrete moment frxame structures, after improvement with the system of lixnked beams, the differences compared to before the improvement are very significant, and the drift controls of the improved building with the lixnked beams system meet the stiffness criteria well. baxsed on this, in addition to the beams, plastic hinges have been created in the lixnk elements that have more suitable replaceability. The amount of rotation of plastic hinges in the beams of the improved structure has decreased. The total number of plastic hinges in the improved structure has increased and the functional level of the beam and column and the structure has been improved. The results of non-linear static analysis show that the overall stiffness of the structure has increased by 10-15% for 5-story structures and 30-40% for 10-story structures, and the drift has decreased by 20%; However, the increase in resistance is low and around 5%. The results of the nonlinear time history analysis show that the amount of energy consumption in improved structures is higher and permanent deformation is lower. Also, the improved structure entered the non-linear region at a lower displacement and has a higher ductility coefficient, additional resistance coefficient and behavior coefficient.