To generate terahertz radiation at HLS-II, a low-α_c lattice scheme is proposed. The new lattice can reduce the bunch length in the storage ring, thus enhancing the coherent synchrotron radiation in the THz region. In this paper, the design and optimization of a low-α_c lattice is reported. The new lattice preserves the symmetry of nominal lattice and reduces the first and second order momentum factor at the cost of increasing maximum β function and natural emittance. The bunch length is tracked and the result shows that the low-α_c lattice can effectively compress bunches in the storage ring. The performance of this low-α_c lattice can be further studied and improved.
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