Abstract: An eficiency system of propagation jn vitro of Phlox subulata L．was developed. The optimum sterilization of young shoots was 10 minutes with 0.1% HgCl_2. The rate of shoots forming from 1 mm shoot tips reached 83.3%. The multiplication cogmcient of in vitro decapitated shoot was 50％ higher than
the multiplication coefficient of whole shoot．For cultivars ‘Daniel cushion’and ‘Tamaryuu’．the multiplication coeficients reached 18 and 8 respectively． On the half strength MS medium supplemented with IBA 0．2 mg/L．the rate of rooting of in vitro shoots of P.subulata L． reached 80％.The survival rate of
plants transplanted on a large scale was more than 90％ ．The eficiency of multiplication of Phlox subulata L．was afected significantly by genotypes．

Key words: Phlox subulata L．, Propagation in vitro, Shoot tip, Rooting