<p>Reinforced concrete buildings include a high amount of existing buildings of the country. A considerable percentage of these buildings require more retrofitting, shake optimization and maintenance due to couple of reasons such as changes in the structure regulations, building bugs, application change and etc. So far, different methods have been introduced to stiffen the construction. In order to select the best method, one requires information, reliable scientific and experimental comparisons and modern decision modeling. In this research, firstly the usual reinforcement methods in Mazandaran are recognized and basic factors for comparison are specified based on which some objective questionnaires are made by experts in reinforcement issue. Ideal choice or TOPSIS model which is a multi-criteria decision analysis method were used to review, analyze and conclude these questionnaires. According to the conclusions shear wall and FRP methods earned higher priorities to be used for reinforcement.</p>