Temperature-dependence and excitation-intensity-dependence of photoluminescence spectra for both disordered and ordered Ga0.52 In0.48P are measured.The disordered sample is charactierized by its single pcak photoluminescence spectrum which is excitation-intensity.independent and has different activation energy at different temperature region.The ordered sample shows double peaks,the intensity of the high-energy peak has an anomalous increase firstly and quenches afterwards.The relative henomena are reasonably explained in terms of lattice ordering and orientation superlattice model.