Abstract:A method for determination of boron by spark source atomic emission spectrometry in stainless steel for nuclear power was introduced in this paper. The influences of spectral lines and structural form of boron on the determination were discussed. The calibration curve was prolonged and the spectral overlapping interference caused by chromium and nickel was eliminated by interference coefficient method. It was found that the upper limit of determination was 1.6 % for boron as B 182.64 nm was used as the analytical line. The proposed method was applied to the determination of certified reference material and actual sample of stainless steel for nuclear power, and the results were consistent with the certified values or those obtained by wet analysis method,the relative standard deviation(RSD,n=7) was smaller than 3%.