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With the recent remarkable development of information and communication technology, the “Fourth Industrial Revolution” is just about to take place. The fourth industrial revolution brings about a drastic change in manufacturing through cyber-physical systems. The cyber-physical system is referred to as the digital twin. The use of the digital twin will be indispensable in the trend toward high-mix low-volume production and mass customization. Undoubtedly, computer simulation will play an important role in the construction of the digital twin. The digital twin-based manufacturing will be used in powder products exactly. To construct the digital twin of the powder process, the Discrete Element Method will be employed, herein a highly efficient computational model, a computational model with high reproducibility of realistic phenomena, and reflection from the real world are required. In addition to developing computational models, analysis of big data in cyberspace and development of surrogate models are necessary as well. From the background, this paper aims to show my latest studies regarding the core technologies for the digital twin. [ABSTRACT FROM AUTHOR]