Let πΊ(π, π) be a connected graph and π π£ (πΊ) be its corresponding vertex semi middle graph. A dominating set π· β π[π π£ (πΊ)] is Nonsplit dominating set β©π[π π£ (πΊ)] β π·βͺ is connected. The minimum size of D is called the Nonsplit domination number of π π£ (πΊ) and is denoted by πΎ ππ [π π£ (πΊ)]. In this paper we obtain several results on Nonsplit domination number.