We have studied the neutrino-less double beta
decay(0$\nu\beta\beta$) of $^{48}$Ca
with the CANDLES III system, which consists of CaF$_{2}$(pure) scintillators.
The first result of $^{48}$Ca double beta decay with the CANDLES III system
was obtained by using 130.4 days of data.
In this measurement,
we achieved a background free measurement
and a low background condition of 10$^{-3}$ events/keV/yr/(kg of $^{\rm nat.}$Ca).
The sensitivity of this measurement, however, was limited by the small amount of $^{48}$Ca.
For a more sensitive measurement of $^{48}$Ca 0$\nu\beta\beta$,
we have developed new techniques for $^{48}$Ca enrichment
and CaF$_{2}$ scintillating bolometer.
In this paper, we will also show the current status of these techniques.