G. Jeffrey presented a form of the heating plate, which has the physical description of circular plate and square plate [9]. Because of the characteristic of the plate model and the distribution of electromagnetic wave that have the symmetrically and evenly distribution, so the plate is fed with only one point. However, the seeds are flowed through the finite structure which are circularly and square plate. They are unsuitable structures for the moveable materials. Specially, the rectangular plate is suitable used for elimination of insects that are mingled in the seeds. The heating space can be increased by using the rectangular plate, which is suitable for agricultural industry.