Abstract: On the basis of the dynamic field plant distribution model with the seed drop tube of precision planter the whole moving process of seeds on the seed drop tube was described in this paper. The synthetically friction coefficient of the seed on the seed drop tube was measured by test. The error of delivery and discharge seed were also determined. Applying computer simulation technology, the field plant distribution law of the typical precision planter joining the seed drop tube was predicted. At last, the results of computer simulation were confirmed by field tests.