The results of regeneration ability study of apple and pear explants in relation of micropropagation continuance  was represented. The long ( to 10 passages) cultivation in vitro has an influence on proliferation ratio, increase this mark at 5-7 passages, for rootstocks 54-118 and PG12 the rooting percentage was increased too. Some clones has more less rooting ratio, such as rootstock 62-396 and pear genotype №10 to 15,9 % and 26,7% respectively.