Microfibrillated cellulose(MFC)films were successfully prepared from bamboo processing residues,primarily composed of bamboo parenchyma cells,via ultrasonication followed by a simple vacuum filtration.The effects of thickness and moisture on the tensile properties were investigated.Increasing the MFC film from 10 to 200 μm,the tensile stress and elongation at break of MFC film increased from 124 to 179 MPa,0.9 to 5.5%respectively.However,the thickness of film slightly affected the tensile modulus little.The moisture content had a great effect on the tensile properties of MFC films in lowering the tensile modulus from 12 GPa to 2 GPa and tensile stress from 180 MPa to 90 MPa,however,raising the elongation at break form 5%to 15%,with an increasing of moisture content of MFC film from 5 to 60%.This is due to MFC films became weaker but softer with increasing amount of moisture acting as a plasticizer to occupy the space between microfibrils.