This study was attempted to carry out the effects of heavy metals when starfishs (Aster inn pectin if era, Asterias amurensis) formed early embryos. From the results of the experiment for the effects of heavy metals on the development of starfishs, the ranking of heavy metals according to decreasing effects upon the. fertilization and development of Asteruis amurensis eggs was follows: Hg, Cu, Zn, Cd, Ni, Pb, Cr, As, and Fe. On the other hand, the ranking of heavy metals according to decreasing effects upon the fertilization and development of Asterina pectinifera eggs was follows: Cu, Hg, Zn, Cd, Ni, Cr, Pb. As, and Fe. In most heavy, the ranking of experimental animals according to decreasing effects upon fertilization and development of starfishs in the same concentration of heavy metals was follows: Asterina pectinifera, Asterias amurensis.