This volume was compiled from the papers presented at the 9th Asia Conference on Mechanical and Materials Engineering (ACMME 2021) and 2021 6th International Conference on Civil Engineering and Materials Science (ICCEMS 2021), which were held successfully as a virtual conference from June 26-28, 2021. Collected papers reflect the last tendencies in creating the new materials and technologies, investigation of structural materials properties, and possible ways to use them.