Abstract: The parameters of cassava mechanical properties are very important for the design, dynamic simulation and mathematical model of cassava harvester. Mechanical properties of cassava root and stem (South China 205) were tested experimentally by WDW3100 universal materials test machine. The data were analyzed by mathematical statistical analysis method. The results showed that cassava root could be considered as isotropic material. The average of root axial tensile strength, axial compression strength, radial compression strength, axial shear strength, radial shear strength, strength , axial elastic modulus and radial elastic modulus are 0.34, 0.74, 0.76, 0.22, 0.37, 2.66, 7.23, 7.22 MPa, respectively. Cassava stem could be considered as anisotropy material. The average of stem axial tensile strength, axial compression strength, radial compression strength, axial shear strength, radial shear strength, bending strength, axial elastic modulus and radial elastic modulus are 10.23, 6.26, 1.43, 1.86, 2.53, 10.80, 5.24, 35.36 MPa, respectively.