The CMS/CMS/ITRI Temperature and Humidity Group maintains and develops Taiwan’s national standards of temperature for both contact and non-contact thermometry, realizes and disseminates ITS-90 in the range from -190 °C to 3000 °C. A primary acoustic thermometry system was newly established in recent years in liaison with some leading NMIs, especially NPL. It conducted the uncertainty budget on thermodynamic temperature measurements, comparing of thermodynamic temperature to ITS-90 temperature with low uncertainty up to 373 K, and is heading to higher temperature up to about 573 K.