Abstract:Abstract:To review the temperature transfer quantity and dependability of standard Platinum-30% Rhodium/Platinum-6% Rhodium thermocouple, the informal research comparison was called for nationwide in 2020. It was the first time to launch stand-ard PtRh30-PtRh6 thermocouple calibration comparison.14 calibration labs participated the activity and National Institute of Me-trology was taken as pilot. 13 labs were got the satisfaction results in which the difference between the reference and participant was less than 12uV in EMF at whole calibration points and which was the maximum tolerance deviation according their self-announce capability of verification temperature standard. The several criterions and technical line and transfer process in comparison protocol were reasonable and the annealing method in preparation the transfer articles and interval of check in comparison transfer cycle should be improved in approach formal comparison.