An eco-friendly biodegradable bio-composite were prepared using sisal fiber and cassava starch by using handmade mould.Bio-composites are finding applications in many fields ranging from construction industry to automotive industry,so we have synthesized and characterized such composites.Surface morphology,glass transition temperatures were investigated by SEM and TGA/DTA study respectively.XRD patterns confirm crystallite size and degree of crystallinity is found to be maximum for S1.5 composite as compared to other two composites and that may be due to properly wetting the fiber by matrix.SEM image shows roughness surface structure of composites.TGA/DTA analysis shows with increases in starch concentration in the composite glass transition temperature increases.So higher the percentage of starch in composite increases the free volume and molecular mobility, which results in increasing of Tg
