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The dark matter search project by means of ultra high purity NaI(Tl)scintillator is now underdevelopment. An array of large volume NaI(Tl)detectors whose volume is 12.7 cm$\phi\times$12.7 cm is applied to search fordark matter signal. To remove radioactive impurities in NaI(Tl) crystal is oneof the most important task to find small number of dark matter signals. We havedeveloped high purity NaI(Tl) crystal which contains small amounts ofradioactive impurities, $<4$ ppb of $^{nat}$K, 0.3 ppt of Th chain, 58$\mu$Bq/kg of $^{226}$Ra and 30 $\mu$Bq/kg of $^{210}$Pb. Future prospects tosearch for dark matter by means of a large volume and high purity NaI(Tl)scintillator is discussed.

Search for cosmic dark matter by means of ultra high purity NaI(Tl) scintillator