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Abstract. In order to find out the correlation between the shear characteristic parameters and physical parameters of the paddy soil in plastic state and provide a basis for the design of the walking machine for paddy soil. Direct shear tests were carried out indoors on the remolded paddy soil by using a self-made shearing characteristic measuring device. A central composite design method of second order regression orthogonal rotation was carried out with clay content, soil moisture content, soil density as experimental factors and with soil cohesion, internal friction angle as response values. Both single factor and interactive factor on response values were analyzed by using the regression analysis and response surface analysis method in the data processing software Design-Expert. The results indicated that: in terms of significant degree, the influence factors of cohesive force were clay particle content moisture content and soil density; the influence factors of internal friction angle were moisture content soil density and clay particle content. The three element two polynomial regression model between the response values and the independent variables was established. The correlation coefficient between cohesive force and internal friction angle and the independent variables were 0.95 and 0.94. The results show that the error between the predicted and the measured values is within 10% while the physical parameters are brought into the prediction model and the model can effectively predict the shear characteristic parameters under different physical parameters.