In order to solve the problems of excessive dependence on importation, independent design and over-prolonged traditional design cycle and so on, the expression methods and reasoning mechanism of high-speed transplanters were applied. Finally, a designing inference engine and parametric parts models were built. Taking Visual Studio 2008, Oracle, Pro/E as major development platforms, the technologies of secondary development and database programming were adopted in developing the interface of the design system software. By combining the design knowledge, inference engine and parametric model of high-speed transplanter chassis, the knowledge-based rapid design of high-speed transplanter chassis was achieved.