Abstract: To avoid absorbing moisture from the air, we have sealed all samples in high vacuum, and performed 7Li NMR investigations during pre-crystallization process of amorphous ionic conductor B2O3-0.7Li2O-0.7LiCl-xAl2O3(x = 0.15, 0.10 and 0.05) at 293 K and 77 K. We find that there is only spin-spin relaxation time of lithium ions in solid phase, T2= 87μs, which obeys Gaussian decay law at 77 K. At. room temperature all lithium ions devide into two phases. T2s of lithium ions in solid phase still obeys Gaussian law of decay, T2s =127 μs, but T2l of lithium ions in liquid phase obeys Lorentzian law. For three amorphous lithium-ionic conductor B2O3-0.7Li2O-0.7LiCl-xAl2O3 (x = 0.15, 0.10 and 0.05), T2l of lithium ions in liquid phase increases rapidly, i.e. their width of 7Li NMR absorption line becomes much narrower at about 401°,388°and 381℃ respectively. Hence the physical picture of interfacial effect between amorphous matrix and the crystallites is again confirmed.