Ultra-Coarse-Grained (UCG) model whose resolution is less than residue-based coarse-grained model, is being developed in recent years. In this work, we attempt to construct a UCG model with a classical G (o) over bar -like potential. The heterogeneous parameters of local and nonlocal interactions in the energy potential function are derived by using fluctuation matching method. The simulated results with UCG models indicate that it could reproduce the root mean square fluctuations as accurate as that of long-time all-atom simulations. Therefore, the UCG model has great potential in the simulation of huge biological systems such as biomaterials. (C) 2017 Elsevier B.V. All rights reserved.