This paper investigates the flexural behavior of structural lightweight foamed reinforced concrete (LWFRC) one-way slabs reinforced with GFRP bars, finite element analysis ANSYS. Using the experimental data and compressive strength of cubes for six concrete mix for light weight concrete with different parameters for hybrid fibers. Also one solid slab 1300 mm in length, 500 mm in width, and 100 mm in depth will be tested experimentally under two-point loads, and concrete cubes will be formed after adding a hybrid fiber of polypropylene and steel fiber to determine the concrete compressive strength and use it in ANSYS software as a variable in the fcu values. Thirteen slabs will be analysed using ANSYS 15 finite element modelling. A verification study will be conducted to validate the FEM results. The studied parameters are (1) the effect of reinforcement type, (2) the effect of reinforcement bar diameter, (3) the effect of elastic modulus of GFRP bars, (4) the effect of concrete compressive strength resulting from fiber content, fiber aspect ratio, and the volume ratio of polypropylene to steel fiber, and (5) the effect of the yield strength of steel bars. Verification of numerical models has been done by comparing the results of the load deflection curves, cracks and ultimate loads with the experimental ones. RC solid slabs were analysed and designed using ECP 203-2020 [1] under two points of loads operating at two-thirds of the span. The experimental results and the results of the ANSYS 15 nonlinear finite element program agreed well.