Abstract: The effects of variation of the temperature and pressure on the nucleation and crystal growth of penetrating fibrous grains of sintered polycrystalline CaMgSi2O6(Di)-NaAlSi2O6(Jd) have been investigated. A more distinct effect of the pressure appears on the crystallization of DiJd at the lower temperature than at the higher temperature. On the contrary, the pressure has a much more effect on the growth and texture of penetrating fibrous grains of DiJd at the gigher temperature than at the lower temperature. The grains of DiJd synthesized under the higher pressure are stronger, and more ordered and compact than that synthesized under the lower pressure. The critical temperatures of nucleation and growth of DiJd are increased with the elevated pressure. And the maximum rates of nucleation and growth are also increased and moved toward the high temperature with the elevated pressure.