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edge of graph G, the distance between x and uv is defined as follows: d(x, uv) = min{ d(x, u), d(x, v) }, where d(x, u) is the length of the shortest path that connects x and u in G. For uv∈E(G), let mu = |{ f∈E(G): d(u, f) < d(v, f) }|. GA3 index is a possible tool for QSAR/QSPR researches and it gives somewhat better predictions than those of GA2 does [1, 2]. In this paper we study the third geometric-arithmetic index of TUC4C8(S) nanotorus. For the figure of TUC4C8(S) nanotorus, see [3].