Impossibility of recycling and high expense have always been considered as two major problems of development of polymer composites in the world. But nowadays, using of natural fibers in preparation of composites informs good future for composite industry. These fibers easily return to nature cycle and have much lower cost. Natural fiber reinforced composites have applications in different industries such as automobile, building and etc. Milkweed fibers belong to Iranian native fibers which have unique features like hollow structure, without crimp and low density and producing of composite by these fibers can result special properties. So according to the increased application of Natural fiber reinforced composites and unique features of native fibers, study of milkweed fibers reinforced composite is important. In this study, milkweed fibers with two weights 100, 150 g were fed to experimental Carding machine. Obtained webs of milkweed fibers which are a collection of fibers with random conditions and directions, were needled in three different densities. On the fibers web, by using of soda 5% at 50-60 , surface chemical modification process was performed in 3 times 30, 60 and 90 min. Then, layer of fibers was putted in boiling water and detergent for 1 h. By using of polyvinyl acetate resin, composites were produced by manual method. Effect of three variable factors including the weight per area of web, needling density and the time of the alkaline treatment on the properties of composite was studied. Density, volume friction, weight per area, tensile and flexural properties of composite was measured and effect of three variable factors on them was studied. Elastic module obtained from experiments was compared to presented theoretical models and the closest model to experimental data obtained. The results showed that flexural and tensile strength of composite produced with unmodified fibers is lower than pure resin that shows inappropriate interaction between fiber and matrix. Also increasing time of modification treatment with alkali, first improved tensile and flexural strength of composite and then decreased it; that is because of damaging fibers in proximity to alkali for long time. The weight per area of fibers has significant effect in mechanical properties of composite and with increasing it, mechanical properties of composite, specially flexural strength increases. Increasing Needle punching density lead to increase tensile properties and decrease flexural properties. In addition, calculated tensile module based on Halpin-Tsai modified model had most consistency with experimental results. Key words : estabragh Fibers, polyvinyl acetate, green composite, Crosslinking, mechanical properties