This manuscript is a study of Pre A*-functions. Here a Pre A*-function de?ned as a mapping f : 3 n ¡! 3, where 3 = f0;1;2g is a Pre A*-algebra. Further it has been determined various properties of Pre A*-functions. Some basic properties of Pre A*-functions such as duality, order relation and erstwhile properties are identi?ed in this document.