Abstract: This paper has analysized the solid solution strengthening of Cr and W in Al₂O₃ and TiC for Al₂O₃-TiC cermet by secondary electron image(SEI), backscattered electron image (BEI) and generating X-rays with JCXA-733 type electron probe, X-ray micro-analyser and 3014 type X-ray diffraction unit. The streng thening mechanism of Al₂O₃ and TiC,two continuous mesh skeletons which penetrate into each other was also studild. The present work has practical significance for the trial-preduction of high quality cermet used for cutting tool materials.