The face-center-cubic structure obtained by four incident laser beams directly from air to photoresist of planar construction, is actually a kind of distorted face-center-cubic structure. Both of its lattices and its latticesites are lengthened along [111] direction. In the study on the lattice shape and band structure of this distorted face-center-cubic structure, using MIT's Photonic-Bands program, after calculating the relations between the energy band structure and all kinds of parameters of opal and inverse opal, a complete photonic band-gap in its opal structure is obtained. The largest photonic band-gap is obtained as the lengthening ratio is 2.1 and the filling ratio of silica is 13.7%. For fabrication of this structure with largest photonic band-gap by holographic lithography method, which needs two steps (fabrication of opal and fabrication of inverse opal by filling), the three outer beams are placed symmetrically around the central beam, the three outer beams are 54.0° apart, and the angles between the central beam and outer beams are 31.6°.