Abstract: To clarify influence of wheat straw related characteristics on forming process of round baler, impact, bending and compression tests of wheat straw were carried out based on movement process of wheat straw entering baling chamber of round baler．Relevant mechanical property parameters of wheat straw were obtained through experiment, and experimental data were fitted by Origin software to get a fitting equation．Collision test results showed that bounce height of wheat straw increased with increase of landing speed under certain conditions．Bending test results showed that peak load of wheat straw increased with increase of moisture content under certain conditions, and decreased with increase of loading speed．Radial compression test results showed that peak load of wheat straw increased with increase of moisture content and loading speed under certain conditions．Therefore, impact of these factors on baling process needs to be considered in subsequent design and testing of round baler．