Research focused on improving physical and mechanical properties of LLDPE composites reinforced with hemp fibres. As the previous studies show, due to their polar and hydrophilic nature, natural fibres show poor compatibility with hydrophobic polymers. This incompatibility could lead to weak interfacial adhesion as well as to the non-uniform dispersion of fibres within the composite. To overcome incompatibility several strategies have been tested to enhance the adhesion between the lignocellulosic fillers and the polymer matrix. These strategies generally involve fibres modifications by physical or chemical methods. Chemical modification of natural fibres used in this study involves various chemical treatments in order to reduce the content of hydroxyl groups and/or introduce cross-linking between the filler fibres and the polymeric matrix. 2% sodium hydroxide treatment, grafting with 5% maleic anhydride in combination with the sol-gel [1-2] fibers pre-processing were used to obtain twelve composite variants. Surfaces of modified fibers and composites with fibres content in a range from 30 wt.% to 50 wt.% were evaluated visually and by atomic force and scanning electron microscopy. Influences of hemp fibres content and fibres pre-processing method on melt flow index, composites mechanical properties, water sorption and surface microhardness have been investigated.