For a group G and a non-empty subset Ωof G,the commuting graph C(G,Ω) of Ω is a graph whose vertex set is Ωand any two vertices are adjacent if and only if they commute in G.Define T4n =<a,b | a2n =b4 =1,an =b2,b-1ab =a-1>,the dicyclic group of order 4n (n ≥ 3),which is also known as the generalized quaternion group.We mainly investigate the properties and metric dimension of the commuting graphs on the dicyclic group T4n.