The generalized connectivity is an extension of the traditional connectivity. It can measure the ability of a network G to connect any s vertices in G. For \(S\subseteq V(G)\) , \(\kappa _G(S)\) denotes the maximum number r of internally disjoint trees \(T_1,T_2,\ldots ,T_r\) in G such that \(V(T_i)\cap V(T_j)=S\) for \(i,j\in \{1,2,\ldots ,r\}\) and \(i\ne j\) . For an integer \(2\le k\le |V(G)|\) , the generalized k-connectivity of G, denoted by \(\kappa _k(G)\) , is defined as the minimum value of \(\kappa _G(S)\) over all \(S\subseteq V(G)\) with \(|S|=k\) , i.e., \(\kappa _k(G)=\min \{\kappa _G(S)|S\subseteq V(G)\,\,\,\text {and}\,\,\, |S|=k\}\) . Exchanged crossed cube ECQ(s, t) is an important variation network of hypercube. In this paper, we get that \(\kappa _4(ECQ(s,t))=s\) with \(3\le s\le t\) .
