Composites are one of the advanced material that two or more components combine together and cause to produce a new mixture with superior mechanical and physical properties. These components keep their initial properties, while don’t blend together. Panels are one kind of composites and lightweight structures consisting of a central part called the core and two layers located on both sides of core that named skins. The aim of this project is construction of reinforced concrete composite panel with three dimensional spacer fabric. This type of composites are used as the separator walls. In the first phase of this project, woven mesh textiles made of different types of thread including nylon66, high molecular weight polyethylene, glass, polyester, polypropylene were fabricated. Each fabric was located in the top and bottom of the neutral axis. In the second phase, three dimensional woven spacer fabric from different types of thread mentioned above was produced. Spacer fabric is consist of two outer layers and thread spacer through-thickness yarns for connecting two layers. Lightweight concrete as matrix was made of cement, sand, foam and water. Unreinforced lightweight concrete was also built as a control specimen. Different forces inserted into the structure including horizontal wind force, earthquake or forces caused by shrinkage and temperature changes lead to bending deformation of the structure. So flexural properties characterized by three point bending test and flexural parameters including displacement until fracture, flexural strength and toughness were survived. Fabric thickness, fibre kind and number of through thick yarns were the independent variables of the experimental design. The result showed that interbonding effect and tensile reinforcement after the first crack effect increase deformation, strength and toughness of the panel composites. The maximum flexural strength of the mesh woven reinforced concrete is related to polyethylene textile reinforced concrete and the minimum strength is related to polyester textile reinforced concrete. The reason of this event is slip of fibres through the matrix. In all of spacer textile reinforced concrete samples except of glass spacer textile reinforced concrete, increment in flexural strength compared to mesh woven textile located in top and bottom of neural axis were observed. This phenomena is due to the lack of transmition of forces from the top layer to the bottom layer due to rupture of the connecting threads through the thickness. The effect of using of textile and different types of fibre on energy absorption was measured by toughness parameter. In addition with reinforcing concrete by textile, toughness was increased. In the final, a mechanical model of bending theory of beams was used to the analysis of results. This model showed relatively proper matching with experimental data. Existence of thermal stresses is one of the main cause of cracking in cement structures. So, thermal stresses and heat transfer at different period times and in three different temperatures of 40, 60 and 80 ? were studied. The amount of thermal stress with time is decreased. Nylon spacer textile reinforced concrete had the minimum heat transfer. Advantages of this product are lightweight, proposing high specific load-bearing capacity, prefabricated, having proper mechanical performance, economical, low cost manpower, reduction of runtime, ease of traortation and thermal isolation. Key words Cement composite, lightweight concrete, woven spacer fabric, flexural performance, thermal isolation, thermal stress.