Abstract: Among 7008 people of Han, Hui, Dongxiang, Tibetan, Yugu, Baoan, Tu. Kazak, Mogolian, Salar, ten various nationalities in Gansu and Qinhai were determined by Harris- Kal-mus' modified method of threshold determination. By using No. 3 solution as the borderline of taste-blindness, the result shows (1) The taste-blindness frequency has significant difference.(P <0.001) among various nationalities. So far the taste-blindness of Baoan nationality is higher than Li nationality. (2) There is no difference of taste -blindness between female and male in various nationalities in total, but females' taste threshold is lower than male. (3) PTC taste blindness and taste threshold had nothing to do with anomalous color vision.

Key words: Phenylthicarbamide; Taste sensitivity; Taste-blindness; Anomalous color vision