One dimension angular correlated positron annihilation radiation curves of amorphous lithium ionic conductor B2O3-0.7Li2O-0.7LiCl-xAl2O3 (x = 0.15, 0.10, 0.05) during the crystallization process have been measured, and the linear parameters S in normalized dispersion of electron momentum have been calculated. From the parameters S we can also disclose the variations in defect-density during the crystallization process.Experimental results show that the parameters S at room temperature are not Largely affected by the content of Al2O3, each and all greatly decrease after full crystallization process, each and all slighly increase at the beginning of crystallization, but then increase anomalously at about 400-450℃ only when x= 0.15. These results verify and complement the results obtained from measuring average positron lifetime. From them we are convinced of the physical picture that the boundary layer contains a lot of defects.