Here, E LE mn represent the energies (m = n) and exciton couplings (m ̸ = n) of LE states. The same is true for E CT mn but for CT states and E CT -LE mn,n ′ are the couplings between LE and CT states. To parameterize the electronic Hamiltonian, we adopt "Fragment Particle Hole Density (FPHD)" method proposed by our group recently. The FPHD constructs these exciton states' energies and couplings from adiabatic states through maximizing the particle and hole densities on predefined molecular fragments, and it has the ability to simultaneously handle multiple fragments and hundreds of electronic states. Additionally, this methods allows for switching on and off the couplings between different types of diabatic states, making it possible to find the cost-effective balanced approach for studying multichromophoric systems and assess the impact of different types of quasi-diabatic states on the spectra. In this work, the minimum model chosen for the TDDFT calculation is a tetramer system, and the parameters extracted from tetramer are applied to construct the electronic Hamiltonian of larger oligomers. Here, we explicitly considered the boundary effects of the finite-size oligomers and apply the parameters of two units in the middle of tetramer to extend the system's Hamiltonian.