The use of steel bars in the construction industry goes back more than a hundred years. Despite having high resistance, steel is subject to corrosion in corrosive environments, and this results in high maintenance costs. Therefore, it is necessary to use FRP rebars as an alternative to steel rebars, and the bond of FRP rebars and concrete is very important. Considering that the bond of FRP rebars and concrete is less than that of steel rebars and concrete, it is necessary to study the effective factors in the bond of FRP rebars and concrete experimentally and numerically and determine the optimal conditions, which is discussed in this research. The investigations showed that the rebar surface, rebar diameter, embedment length, concrete compressive strength, concrete cover, stirrup around the reinforcement and the distance of the reinforcements from each other are influential factors on the bond behavior of FRP rebar and concrete