The concentrations of 12 elements (Cr, Mn, Fe, Co, Cu, Zn, As, Se, Ag, Cd, Hg, Pb) in ten coastal seawater samples collected from Nghe An and Ha Tinh Provinces were simultaneous determined by Inductively Coupled Plasma - Mass Spectrometry method (ICP - MS), using APDC/MIBK solvent extraction to preconcentrate and separate the elements from high dissolved solid matrix of the samples. The method has low detection limits with ppt level, the relative standard deviations (% RSD) are less than 7.5%, and the recovery of elements are in the range from 63.5% to 107.7%, which meets AOAC requirements for trace analysis. The results of analysis showed that most of the elements are in the limited range of concentration according to Vietnamese regulation (QCVN 10-MT:2015/BTNMT), except cadmium in one sample and mercury in seven samples are higher.