The composites formed by sugarcane bagasse and thermoplastic Polymers, such as polypropylene (PP), polyethylene (PE), and ethylene-co-vinyl acetate (EVA), have been analysed by carbon-13 high-resolution solid-state nuclear magnetic resonance (NMR), employing crosspolarization magic angle spinning (CPMAS); variable contact-time experiment and proton spin-lattice relaxation time in the rotating frame. NMR responses showed that these techniques can be used to observe the degree of compatibility and homogeneity of different polymers composites.