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Aggregates are important in material and life systems,and attract much attention.Due to the complexity of non-bonding interactions,Theoretical methods are necessary for studying aggregates.Based on the model from works of Spano et al.[1,2],we develop a method to compute the spectra for aggregates at different scale.Firstly we improve transition density cube (TDC) method [3] to calculate the excitonic coupling.Cube grids with little transition density charge are ignored,which can save computational time nearly without accuracy damage.