Abstract: In the test, the contents of Cu, Fe, Mn, Zn in the basal mixed diet of cow in dry period in the eastern of Hebei was determined by using atomic absorption spectrometry and its surplus and deficiency was analyzed to provide the reference for the formulation of cow diet in the dry period. The result of test showed that, the contents of Cu, Fe, Mn, Zn in the basal mixed diet were 299.87, 14.38, 37.70 and 32.67 mg/kg resp. The Fe content was 16 times of the Fe requirement of cow in dry period reported in NRC （2001） and 3 times of the requirement reported in the other literatures. The Cu content reached the requirement of cow in the dry period. The Mn, Zn content reached the requirement of cow in the dry period reported in NRC （2001） and was lower than the recommended requirement in the literature.