Abstract: Abstract: Corn seeds' directional and fixed-distance output and embryo surface's identification are the keys of mechanically directional sowing of corn. Besides, corn seeds' directional and fixed-distance output is also the base of embryo surface's identification. However, at present, there are few studies on corn seeds' directional and fixed-distance output, and there is even no practicable implementation. In order to deal with the problem, a dent corn seeds' directional and fixed-distance output device with lateral standing posture was designed based on electromagnetic vibration in this paper, and implementation principles of orientation and fixing distance for corn seeds by this device were discussed. The device was composed of 2 parts: corn seeds' arraying mechanism with lateral standing posture and corn seeds' directional and fixed-distance mechanism. The second part was the crux of this device. The corn seeds' arraying mechanism with lateral standing posture was made up of circular electromagnetic vibrator and hopper. After dispersion, orderly transportation, separation and posture transformation by corn seeds' arraying mechanism with lateral standing posture, the stacked corn seeds became arrayed with lateral standing posture. After orientation and fixing distance by corn seeds' directional and fixed-distance mechanism, the corn seeds arrayed with lateral standing posture were output with tip-forward state, and the spacing between adjacent seeds was consistent. The core part of corn seeds' directional and fixed-distance mechanism was directional and fixed-distance function module, and it was a combination of lateral feeding orbit, directional and fixed-distance turntable, left and right side panels and lateral output orbit. Corn seeds' directional and fixed-distance mechanism had 4 essential working parameters, namely inclination angle of lateral feeding orbit, amplitude of lateral feeding orbit, angular velocity of directional and fixed-distance turntable, and amplitude of lateral output orbit. The result of implementation principles showed that the 4 working parameters had great influence on the process of orienting and fixing distance for corn seeds. Inappropriate working parameters could cause unsuccessful orientation and fixing distance for corn seed. In order to optimize the working effect of corn seeds' directional and fixed-distance mechanism, the simulation model of the directional and fixed-distance function module was established by software ADAMS (automatic dynamic analysis of mechanical systems), and then orthogonal tests and single-factor tests were carried out. The inclination angle of lateral feeding orbit, amplitude of lateral feeding orbit, angular velocity of directional and fixed-distance turntable and amplitude of lateral output orbit were taken as factors, the success rate of orientation and fixing distance for corn seed and the spacing between adjacent seeds as test indices. Based on the analysis of experimental results, the optimal working parameters were determined: Inclination angle of lateral feeding orbit is 3°, lateral feeding orbit is 0.3 mm, angular velocity of directional and fixed-distance turntable is 30 °/s, and amplitude of lateral output orbit is 0.3 mm. Under the condition, the success rate of orientation and fixing distance for corn seed reached 94.4%, and the average spacing between adjacent seeds was about 43 mm. In order to verify the accuracy and reliability of simulation optimization result, the practical dent corn seeds' directional and fixed-distance output device with lateral standing posture was produced. According to the optimal working parameters obtained from the simulation test, the working parameters of the practical device were adjusted. The performance test was performed on the basis of 300 corn seeds and the results coincided with simulation very well, which were as follows: 1) The device worked stably under the condition; 2) The realistic success rate of orientation and fixing distance for corn seed was 90.7%; 3) The realistic average spacing between adjacent seeds was about 45 mm. Generally, this research provides the condition for embryo surface's identification, directional packaging and mechanically directional sowing of corn.