Abstract. Natural fibers (NF) are a cheap, easily renewable resource for cellulose-rich polymer composites. Impurities (waxes, lignin, etc.) and hydroxyl groups, on the other hand, decrease the likelihood of NF reinforcing polymeric matrices. Three different chemical treatments were applied to short sisal fibers (SSF) (dicumyl peroxide, alkaline and silane). Mechanical mixing at the melt stage of the polymer matrix ( C) was employed to create composites of ethylene vinyl acetate (EVA) and chemically modified SSF.The mechanical properties of biocomposites were studied in relation to fiber content and chemical treatment. Every SSF reinforced composite that had been treated had a higher tensile strength. The elastic modulus compound increased significantly when compared to the empty matrix. As the fiber content was raised, the elongation at break values fell. Furthermore, it was discovered that the SSF’s surface treatment increased fiber dispersion within the EVA matrix. The thermogravimetic analysis (TGA) was used to examine SSF’s thermal stability . Because natural fiber has a lower specific gravity, it is less expensive and has the added benefit of biodegradability and the composites’ recyclability .