Abstract: The contents of Cu、Fe、Mn、Ti、Zn etc. 20 elements in chinese traditional medicine stantardreference material (SRM ) forsythia suspensa are determined by instrument neutron activationanalysis(INAA). For certificating the accuracy of analytical data, the SRM tomato leaf, tea andloudangsen are analysed simultaneously. The determined values in this work are agreeable withcertified values. The detection limits under experimental conditions are calculated.