Development of ecofriendly biocomposites to replace non-biodegradable synthetic fiber composites is the main objective of this study. the plain woven jute fabric (WJF) reinforced poly(L-lactic acid) (PLA) composites were prepared by the hot press molding method. The mechanical and thermal properties of the composites were investigated .The influence of woven structure and direction on the mechanical properties i.e. DMA and flexural properties was investigated. The results show that the properties of the composites are better than those of PLA. When the content of the fiber is 30%, the composites can get the best mechanical properties. The dynamic mechanical analysis results show that the storage moduli of the PLA/jute composites increase with respect to the PLA. In the present study jute fibers were surface treated using two methods: i) alkali (NaOH) and ii) alkali followed by silane (NaOH+Silane) separately. Effects of surface treatments on jute fibers surface were characterized using fourier transform infrared spectroscopy (FT-IR) ,thermo gravimetric analysis (TGA) and (DSC) . The results from this investigation indicate that a 30 min dipping of the fibers in 0.5% alkali solution followed by 24h 1.5% Silane treatment leads to an increase in the tensile strength of up to 23%. The increase appears to be due to fiber separation and removal of non-cellulosic materials, which, in turn, resulted in an increased crystallinity. Blended of thermoplastic polyurethane (TPU) and (PLA) polymers at different ratios were made via twin screw extrusion and injection molding techniques. Then the blend injects to PLA/jute composite. (FTIR) confirmed the existence of the two components in the blends; differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) confirmed the immiscibility between the TPU and PLA.