Abstract: The frequency of polyeggs and polyembryo-seedlings of APIV are to certain extent related to both the developmental season and the site of the spikelet in a panicle. The frequency in summer was higher than that in autumn. In a panicle, the frequencies in the stronger spikelet were higher, but in the weaker ones lower. However, there was no difference in the frequency between the mainpanicles and the tilling-panicles of heading at the same season.