In particular, Kaikaku NIWA who devoted himself to the calligraphic style of the Jin and Tang dynasties), riding himself of the six-dynasty style, became an examiner of teacher qualification tests at the Ministry of Education (for the category of calligraphy), and advocated placing the standards for calligraphic education on the styles of the three great calligraphers in the early Tang period.
中でも六朝書風から脱皮して晋唐書風に傾倒した丹羽海鶴が文部省教員検定試験委員（習字科）になり、学校の書道教育の基準を初唐の三大家におくことを提唱した。