Atomic absorption spectrometry is used to determine the contents of microelements (such as Zn, Cu, Ca, Mg and Fe) in the all-blood and hair of the Han, Uygur, and Kazak people in normal health state. The results show that the above mentioned elements in the hair arranged successively as Ca>Zn>Mg>Fe>Cu and those in the all-blood of the Han people arranged as Fe>Mg>Ca>Zn>Cu; of the Uygur and Kazak people, as Fe>Mg>Ca>Zn>Cu. This paper reports that the content of the microelement Mg in the all-blood and hair of the Uygur and Kazak people is obviously higher than that of the Han people (P<0.05).