Abstract:Eucalyptus, extensively used in fibre industry, occupy perhaps one fifth of the world‘s man-made forests. The output of wood of this species is one of the three chief tree species in the world. In quest of rapidly breeding tissue culture technique of Eucalyptus has been tested and many rooted plantlets had been regenerated from organ culture and callus culture, but the plantlets induced from embryoid has not been reported yet.Our Institute has been succeeded in inducing the cellular masses culture into embryoids. The materials used are from plus trees №.46 and №.9 of Eucalyptus "leichow №. 1". In the same embryonic cellular mass culture, the unsynchronous embryoid fromation, such as spherical proembryo, heart-shaped embryo, torpedo-stage embryo, embryonic root and embryonic bud, could be observed. The embryonic cellular mass culture was deep red in color, bound together in structure, unever and superficially granulated. They are very active when transferred to subculture, it would increase 10-30 times and further differentiate into numerous rooted plantlets. The plantlets are very easy to be transferred to the soil.