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The use of composites as engineering materials have gained more space in various sectors of human activity. For these materials enable a good synergy between the various components that constitute it, resulting in a range of properties inherent to the material more convenient than the individual components. The strengthening of these composite materials, plant fibers have advantages compared to synthetic fibers because they are abundant, are biodegradable by biological processes, renewable and recyclable. In this paper, polyester matrix composites reinforced by short bamboo fibers arranged randomly were produced, using the lowest possible level of technological processes in production stages. The matrix used was polyester terephthalic pre-accelerated with cobalt naphthenate and cured at room temperature peroxide, methyl ethyl ketone (MEK) in proportion to the resin of 0,33% by volume. The bamboo fibers used were extracted from the campus - Belém of Federal University of Pará.