Abstract: Based on the mathematical model of seed spacing developed by the authours, using Monte-Carlo Method, the paper made computer simulation of seed spacing, plant spacing and setting spacing, produced a histogram and a frequency table for three different situations with Computer PC-1500, and derived the pattern of plant spacing and the reasonable adjusted seed spacing.The approach has been used in a major research project of Liaoning province—A study on comprehensive techniques for precision drilling. The result is coincided with the plant density acually expected.