LIBS technology has many advantages, but the analysis accuracy is affected by factors such as spectral noise interference and matrix effect［1］; the EEMD method can decompose the different characteristic components of LIBS signal adaptively. The MRA method can compensate for the mutual interference between element signals and improve LIBS data accuracy. In this paper, the original signal of the standard sample is obtained through the self-built test system. After being processed by the EEMD-MRA method, the correlation coefficient R2 of the element concentration curve has been greatly improved, greatly improved the accuracy of data, and provided a new way for processing LIBS signal.