<p>High entropy alloys (HEAs) have no less than four principal elements in (near) equal atomic percentage, exhibiting a solid solution state with fine precipitates, as well as distinct material properties. HEAs material design method influences its mechanical and corrosion behaviors significantly, but the underlying mechanism needs further investigation. It has been reported that the second-phase precipitates, work hardening behavior, and corrosion resistance of HEAs are vary depending on the amount of alloying element and heat treatment. The research progress of HEAs and their unique characteristics are reviewed, including microstructural evolution, mechanical properties, and corrosion behaviors. Also the description of HEA’s solid solution and precipitates strengthening will be highlighted. Furthermore, the effects of alloying and heat treatment, on the above-mentioned properties, are discussed. In addition, the challenges, prospects, and industrial applications of HEAs will be discussed. Furthermore, this work points out the future developments of HEAs, fulfilling the strict requirement from industries.</p>