The theory of the grain grading-sifter was used to design the precision rice direct-seeding mechanism and the grading-sifter mechanism was made; Experiments of the precision rice direct-seeding were carried out to test the number of rice seeds thrown out, The diameter of the hill, the average hill spacing and the average row spacing, the variability of the hill spacing and the row spacing.

Three kinds of design methods are presented about indenting tools.

Study on hole former of peanut hill-drop planter mulching film;

Research on boring and caving principle of no-tillage punch hill-drop drill;

Based on the formula calculation and field trials,it is obvious that the rate of holes with seedlings can be rapidly increased and it goes up to more than 90% by planting 2 seeds of corn and soybean respectively in the same hole of red soil upland.