Abstract: Tungsten-ferro alloy is a kind of tungsten-based cermet dispersed fuel matrix with good properties, and the content of Fe will directly affect the service characteristics of the alloy. In order to accurately detect the Fe content in the ferrotungsten alloy powders, ferrotungsten alloy powder weighing 0.1 g is dissolved with nitric acid and hydrofluoric acid, and the 5.5 mol/L nitric acid is used for capacity determination, which can completely dissolve the sample and effectively eliminate the influence of tungsten hydrolysis. The method for the determination of Fe content in the ferrotungsten powder by inductively coupled plasm-optical emission spectrometer (ICP-OES) has been developed. The experimental results show that the linear correlation coefficient intensity at 259.939 nm of Fe element can reach 0.999 985 when the instrument power is 1 300 W, the atomizer flow rate is 0.8 L/min, and the iron content in the sample is 1.5%-15.0%. The relative standard deviation (RSD) of the method can reach 0.45% (n=6), and the average recovery of the method is between 96% and 107%.