Aiming at the problem of low intelligent level of wheat plot seeding system, a wheat plot seeding system was developed based on the principle of differential positioning. The system mainly consisted of Beidou differential positioning system, main controlsystem based on STM32F4, cone grid disk drive system, centrifugal seed dispenser drive system and human-computer interaction system, etc. The main control system collected the Beidou differential positioning information to calculate the matching speed of the cone grid, then controled the grid motor and seed motor to run, and displayed the operation information. The centrifugal seed dispenser structure parameters were optimized by orthogonal test method, and the control model of plot drill speed and cone grid disk speed was established. The test results showed that the coefficient of variation of consistency of each row was 5.69% and the coefficient of variation of uniformity was 20.77%, which verified the feasibility of this electronically controlled seed dispersal system and provided reference for further design of precision plot seeders.