Abstract: For developing vegetable transplanting mechanization, based on the indoor soil bin test, a vegetable transplanter with functions of trenching, seedlings delivery, righting, covering and compacting was designed. The design of seedling delivery mechanism, the curved runner furrow opener and the V-type compactor was completed for better transplanting effects by the virtual prototype technology and optimum design method. Structure parameters of the transplanter were optimized by orthogonal experiments, which included that the velocity was 0.25-0.30 m/s, the vertical angle of send seedlings tube was 12°, and the relative position of compactor was 10 mm. The field experiments showed that the machine had simple structure, good adaptability and its performance could better meet agriculture technique requirements. It can provide theoretical basis for the design of auto transplanters.