Established the method of determination for triethanolamine in early strength agent by gas chromatography.The relative standard deviation(RSD) for this method was ≤ 2.32%,recovery between 93.5%~103.7%,triethanolamine detection limit was 0.5mg /kg.This method is applicable to the cement thickening in the analysis of triethanolamine using gas chromatography for the first time.