A set in a topological space (X,τ) is said to be semi pre open if A ⊂cl(int(clA)). In this paper we discuss about the some more results of group acting on semi pre open set, contra semi pre open and Almost contra semi pre open sets and related theorems. The notions of SO (semi open), βO (beta open) sets, CβO (contra beta open), ACβO ( almost contra beta open ) and βC (beta closed) functions are used to introduce and study a new class of function in this paper.