The use of Nano-concrete (NC) is the most recent field of study in the concrete elements. So, this research was conducted in order to examine the flexural behavior of nano-concrete beams. Also, the effect of HSC reinforced with GFRP was examined. The effect of using glass fiber bars (GFRP) in reinforcement and the effect of it on concrete strain, the cracks patterns, number of cracks and the mode of failure was studied. The experimental program consists of eight RC beams; four NC beams and another four in HSC reinforcing using GFRP with different ratios. A non-linear finite element program corresponding to the experimental one was conducted using ANSYS 14.5 to verify the experimental results for each beam. Results indicated better agreement between experimental and analytical results.