Absorbed by solvent,butanone-toluene mixture was analyzed by gas chromatography(GC). The absorbent could absorb two substances at the same time. This method has higher linearity and precision,and actual sampling meets the practical demands. Furthermore,the selecting absorbent for butanone-toluene mixture was discussed. The selection conditions for absorbent were given. Results showed that the n-hexanol was the proper absorbent for butanone-toluene mixture.