Abstract: The space high temperature oxide crystal growth process was observed and recorded realtimely by means of the space high temperature in-situ
observation facility. This facility has a lot of prominent characteristics, such as automatically photo-focusing lens, multi-working position,
automatically recording image etc. The temperature distribution in high temperature melt was measured by setting different control-temperature
procedure, in the meantime, the boundary shape varying of high temperature oxide crystal and the fluid state of melt in its ambience were analysed,
it was the first time that the even diffuse phenomenon of high temperature solute and the complete cellulation formation in high temperature solution
in space were visualized. In the last, the space experimental results were compared with the ground experimental results under the same growth
condition of technology, for explaining the effect of gravitational convection and surface tension convection under micro-gravity conditions
on the crystal growth in space.

Key words: space, 1n-situ observation, convection, diffuse, cellulation