1. School of Materials Science and Engineering，Southeast University， Nanjing 211189， China
2. School of Materials Science and Engineering，Changzhou University， Changzhou 213164， China
Shape memory alloys possess shape memory effect, super elasticity, good corrosion resistance and mechanical properties, thus they belong a kind of functional material with great development potential and application value.Shape memory alloys have attracted extensive attention since their initial discovery, and have been widely used in numerous fields. This paper systematically summarizes the types, preparation methods, main applications and the latest research outcome of shape memory alloys. Particularly, we focus on the research progress of high entropy shape memory alloys, expound the factors affecting the properties of high entropy shape memory alloys in terms of three aspects including alloy composition, thermomechanical treatment and phase structure, so as to clarify the main factors hindering the development of shape memory alloys and analyze the research value of high entropy shape memory alloys. Finally, the future development direction of shape memory alloy is proposed.