Abstract: In order to satisfy the agronomic requirements of the planting hole formed by the hole forming device of rape transplanter, and provide theory basis for a new design of transplanter, the study of the interaction between pore forming mechanism and soil was conducted according to different soil types with different physical and mechanical properties. The formulas of ultimate shear bearing capacity Qu and soil frictional resistance Qf were deduced, the mechanical models of interaction between hole forming device and soil were established, the parameters of soil physical and mechanical properties of different soil types were determined. Combined the structural parameter of hole forming device, the ultimate shear bearing capacity of soil Ff1 which was produced when the cylindrical hole thorn thrust into soil depth of 75 cm and the soil frictional resistance Ff2 which was produced when the cylindrical hole thorn out of soil were calculated. The results showed that the maximum ultimate shear bearing capacity of soil was up to 1139.7 N and the maximum soil frictional resistance was up to 107.6 N when the cylindrical hole thorn thrust into soil and out of soil. The research provided data and theory for designing hole forming device and further study on the interaction force between different kinds of soil and hole forming device.