Non-crimp 3D orthogonal carbon weave is a specific type of 3D woven fabric which is expected to have high performance as composite reinforcement due to its unique architecture, high functional ability and light-weight benefits. Although there have been many attempts to study and model the mechanical behavior of composites reinforced with this fabric, a few works have been done on own non-crimp 3D orthogonal weave. Therefore, more investigations are necessary in this regards. The aim of this research is producing non-crimp 3D orthogonal carbon weave, investigating into tensile and bending behavior and finite element modeling of it. First, a proper design was proposed for the weave device by studying the advantages and disadvantages of methods were devised so far. Then developed device with the possibility of simultaneously yarn insertion was designed and made. Three different orthogonal weaves in terms of carbon fiber tow type; binder yarns insertion density and longitude yarn's pre-tension were produced The study is focused on realization bending and tensile behavior of weave and measurement of main bending and tensile parameters including stress, strain and modulus. For this purpose, three-point bending and uniaxial tensile test methods are used and the load-displacement curves are analyzed. A comprehensive study on the flexural and tensile performance of carbon composite reinforcements was accomplished and the influence of fiber and weave's parameters such as type of carbon fiber tow, geometry of weave and fiber volume fraction on mechanical behavior of non-crimp 3D orthogonal carbon fabric is investigated. It was difficult to distinguish the initial straight-line portion of the load-deflection curve of non-crimp 3D orthogonal carbon samples under bending due to their forms and analysis of such curves hasn't been done yet. So, in this work an attempt was made by fitting a trilinear model to load-deflection curve. ANOVA analysis results at 95% significant level showed that all three parameters: carbon fiber tow type, warp and weft insertion density and longitude yarn's pre-tension have significant effect on porosity, modulus of elasticity in bending and tensile stress of non-crimp 3D weaves. The results show that, the weft and warp yarn insertion density and longitude yarn's pre-tension increase lead to porosity and bending modulus of non-crimp 3D orthogonal carbon weave increase. The bending rigidity of non-crimp 3D orthogonal carbon weave is strongly depended on type of carbon tow and therefore yarn's bending rigidity. The fabric architecture changes due to different binder yarns insertion densities influencing the stress wave propagation by preventing crack growth, thus leading to improve tensile strength of 3D orthogonal reinforcement. Simulation of mechanical behavior of non-crimp 3D orthogonal woven fabric was performed in meso-scale by finite element analysis. At first, taking rectangular shape with an average size obtained by microscopic images seemed the best option for cross-section shape of yarns in modeling. Based on experimental weave parameters, a set of numerical compression tests simulated using proposed model. The results showed that the model can successfully predict the mechanical behavior of non-crimp 3D orthogonal carbon composite reinforcements. This model will be useful for composite manufacturing process and applications.