Abstract: A precision rice hill-drop drilling machine was developed and it can open the furrow, form the ridge and sow the rice seeds simultaneously according to the requirement of rice planting. The rice seeds were hill-dropped into the small furrow on the ridge. A special designed cell wheel feed was used to control the amount of sowing seeds. A special rubber guard device was developed to replace the traditional guard ring and it can rotate with the cell wheel simultaneously and reduce the rate of damaged seeds significantly. Riding rice transplanter with four-wheel driven was used as the chassis of the machine. Thus, slipping can be reduced and the machine works well in the deep paddy field. The precision rice hill-drop drilling machines have sowed more than 200 hm2 land in 10 provinces in China. The rice yield increased more than 10%, 8% and 5% respectively compared to the manual broadcasting, manual seeding broadcasting and manual transplanting.