The paper initially studies both the s-T 3-separation and the semi-T 3-separation axiom of Khalim-sky (K-for brevity) topological spaces. To do this work, first we investigate some properties of semi-open and semi-closed sets with respect to the operations of union or intersection and further, a homeomorphism, and a semi-homeomorphism. Next, we study various properties of semi-topological properties of K-topological spaces such as simple K-paths. Finally, after introducing the notion of a semi-T 3-separation axiom which is broader than the s-T 3-separation axiom, we find a sufficient and necessary condition for a Khalimsky topological space to satisfy the semi-T 3-separation axiom.