Abstract: A magnetic-field applied to high temperature optical in situ observation (M in situ observation) technique was established in
the authors’ laboratory. An electromagnet was used as a magnetic field generator. This magnet was designed to supply up to 0.14T transversely to the center
of the heater.
By using M in situ observation technique, the relative extent of boundary layer can be reduced and the buoyancy driven convection can also be damped.
The effect of the magnetic-field upon oxide crystal growth was verified tentatively.

Key words: magnetic field, high temperature optical in situ observation technique, oxide crystal growth