A method of simultaneous determination of the major elements in silicate rocks and related materials using inductively coupled plasma atomic emission spectrometry (ICP-AES) was presented. Lithium metaborate fusion technique has been used for preparing the sample solutions. Data on detection limits, calibration method, possible spectral interferences and correction, precision and accuracy of determinations were presented. The analytical results of more than 20 geochemical reference samples wid- ely differing composition have been presented and no significant matrix effects were observe.