A 704 type <$Enothing sup 4 roman He> cryostat is designed and the "National (China) Temperature Working Standard Group of the ITS-90 at 1,2 - 24 K" have been composed. A 703 type <$Enothing sup 3 roman He> cryostat have been established and the working temperature of the "National Temperature Working Standard Group of the ITS-90 at 1,2 - 24 K" is extended to 0,65 K, which is the lowest limit temperature of ITS-90. The 5 rhodium-iron resistance thermometers (RIRTs) which compose the Working Standard Group have been transformed to the International Temperature Scale of 1990 (ITS-90). A set of indexing data is fitted and calculated as the indexing table of the standard facility of RIRT. 42 basis temperature points have been measured at 0,67 - 26,37 K. The results show that the temperature control level could reach 0,5 mK/30 min. The difference between the temperature value of the 5 RIRTs and the average is less than 1,1 mK, and the comparison measurements uncertainty is 0,95 mK.

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