In allusion to the existing rice pot seedling transplanter exists the defects of complex structure, high cost and low efficiency, the transplanting mechanism with b-spline curve gear for rice pot seedling was designed based on parametric modeling software UG NX 8.0. Firstly, the 3-D models of part were built, and then assembled. Secondly, the interference detection of assembly model was done. Finally, relevant 2-D engineering drawings were generated for manufacture. It is provides the reference for the design of rice pot seedling transplanter, and preparation for further simulation and analysis with softwares of Adams and Ansys.