Using rare earth oxides as raw materials,YAG:Ce phosphors are prepared by solid-state reaction which dopes with praseodymium,gadolinium,as well as the praseodymium gadolinium altogether. The excitation and emission spectra of the phosphors are tested by fluorescence spectrophotometer. The results indicates that these phosphors can be excited by blue (455-470 nm) light effectively. The center wavelength of theYAG:(Ce,Gd) emission spectra occurs red shift differently by justing the mol density of doping Gd3+ions,there is a new emission wave crest at about 610 nm in the YAG:(Ce,Pr) emission spectra;not only a new emission wave crest at about 610 nm but also the center wavelength occurs red shift existed in the YAG:(Ce,Pr,Gd) emission spectra. So the flaw of the traditional light emitting diode,lacking of red emitting in the spectra,can be effectively improved. It will be very important for light emitting diode to apply in high colour rendering required field.