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The use of composite materials has increased in recent decades in various industries, especially in the aerospace and automotive. Given this fact is of fundamental importance the knowledge of their properties and their behavior when required mechanically. This work is mainly focused on the analysis of polymer composites reinforced with natural fibers by the Finite Element Method (FEM). The composites analyzed were fabricated in order to use the lowest possible level of processing, which may favor its choice in a future use. The matrix used in this case is the pre-accelerated polyester resin and the reinforcement is the sisal fiber, which is already widely used in the automotive industry, the fibers were arranged in the matrix in a continuous and aligned manner. By the FEM is possible to determine and analyze, both numerically and graphically, the distribution of mechanical stress in the matrix and the reinforcement of the composite.