Abstract: The existing problem of the determination of chromium phosphorus silicon in ferrochromium by inductively coupled plasma emission spectrometry(ICP-AES) is that some samples, such as high carbon ferrochrome, ferrochrome nitride, etc, is difficult to be dissolved by acid. In the alkali fusion matrix, a large number of easily ionized elements sodium makes it difficult to determine, the simultaneous determination of high content of chromium and trace amounts of phosphorus and silicon is particularly difficult. The simultaneous determination method of chromium, phosphorus, silicon in ferrochromium by inductively coupled plasma atomic emission spectrometry(ICP-AES) is a novel method. Through the experimental research, the treatment method of samples by melting in mixed flux of sodium hydroxide and sodium peroxide was determined. In the test by ICP-AES, the interference received is different on each line. Cr 267. 716 nm, Cr 206. 158 nm, P 213. 617 nm, Si 251. 611 nm, Si 288. 158 nm as the analysis line are recommended. For the interference, it is eliminated by using matrix matching and two-point correction method, the linear correlation coefficient of the method was above 0. 995, the precision of phosphorus determination was 5. 0%, the precisions of chromium and silicon were below 1. 0%, the detection limit was below 0. 006% for chromium and silicon, and 0. 002% for phosphorus. Accuracy tests showed that the analysis error between this method and recommendation or manual analysis results was within the allowable range.