High-entropy alloys (HEAs) have attracted the attention of scholars due to their outstanding properties such as excellent fracture, and irradiation resistance for various applications. However, the complex composition space hinders the exploration of new HEAs. The traditional experimental trial-and-error method has a long periodicity and is difficult to understand the complexity of the structural characteristics of HEAs. With the rise of the “Materials Genome Initiative”, simulation methods play an important role in accelerating the development of new materials and speeding up the design process of new HEAs. In this chapter, some of the multi-scale simulation methods, such as density functional theory (DFT) calculations and molecular dynamics (MD) methods, used in designing HEAs and predicting their properties are reviewed. The advantages and limitations of these methods are discussed, and the role of computational simulation methods in guiding experiments is illustrated. This study aims to promote the rapid development of computational simulation methods in HEAs.
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