Abstract: 4 types of Idesia polycarpa Maxim seeds, the local wild type, the artificially cultivated yellow fruit type, the grafted red fruit type, and the artificially cultivated red fruit type, after removing the wax layer, were used as materials to compare the different layering time on generation in order to obtain the best stratification time and type. The result showed that, comparing the effects of different stratification treatment time on seed germination rate, the germination rate of four types of yam seeds increased with the stratification time in the stratification time of 60 to 90 d. Compared with the effects of accumulation time on different types of germination rate, the local wild type had the highest germination rate; and the germination rate from low to high was grafted red fruit type, artificial cultivation red fruit type, artificial cultivation yellow fruit type, and local wild type.

Key words: Idesia polycarpa Maxim., seed, stratification, germination rate