Time-resolved fluorescence and lifetime measurements of Cu+ ions in phosphate glass with different copper concentrations from 0.2wt% to 1.0wt% have been performed at room temperature and 77K. Under UV 220nm or 320nm excitations the luminescence has different behaviours at different temperatures. On one hand, the spectrum excited at 220nm and room temperature are broader than that at 320nm, and move to longer wavel engths with the increase of delay time, while the spectra excited at 320nm show little changes with time evolution. At 77 K, however the spectra vary more slowly. In addition, in the case of increased On+ ions concentration the spectra vary rapidly and greatly in the peak position, and band, width. On the other hand, the experimental results sliow that the decay rates of ions being in the excited stato are dependent upon the emission wavelengths. The shorter the emission wavelength, the faster the ions decay. And a more notable dependence of them appears at 77 K than that at room temperature. The experimental results are interpreted by the energy transfer mechnism, It can be considered as the excitation migration from the sites having higher energy gap to ones having lower energy gap by phonon assisted ion-ion interaction.