To obtain the elastic horizontal displacement spectra that can be applied to displacement-based seismic design, the influences of moment magnitude, rupture distance, and site classes on the displacement spectra were examined using the ground motion prediction equation of Campbell and Bozorgnia. The deficiencies of design spectra in existing seismic design code of buildings (GB 50011-2010) were pointed out and an elastic horizontal displacement spectra model using double parameters, peak ground acceleration (PGA) and peak ground velocity (PGV), was proposed to compensate for the deficiencies. The results show that the starting period of the constant displacement plateau (TD) is an important parameter to determine the spectral shape of the displacement spectra. It is mainly affected by moment magnitude and is increased significantly with the increases of the moment magnitude. The peak ground velocity-to-acceleration (PGV/PGA) ratio is strongly dependent on the moment magnitude, and thus the significant influence of the moment magnitude can be captured by the inclusion of the PGV/PGA ratio in the model. The proposed model is capable of fitting real displacement spectra and can be applied to the seismic design codes by providing the peak acceleration and velocity zonation maps for each seismic precautionary level and giving the peak acceleration and velocity site amplification factor corresponding to the each level in the seismic design codes. The results can provide the reference for the revisions of seismic design codes in our country.