Abstract: The hair sample was digested with HNO_3,five elements including zinc,calcium,iron,magnesium and copper were determined by flame atomic absorption spectrometry(FAAS).And the relations of the trace elements with ages were studied,the data was provided for clinical diagnose of some disease.The contents of Zn,Fe,Ca,Mg and Cu in hair of children can accurately determined using FAAS,the recoveries were in the range of 95.0%~104.0%.