In order to characterize phenomena of acoustic-emission, parameters such as peak amplitude, waveform integral, and ring-down count (or threshold crossing) were considered. As a result correlations between the three parameters are determined. Spectra of the acoustic-emission were analyzed by two methods : peak amplitude distribution and event energy spectra, for the purpose of differenciating the micromechanisms involved with the work-hardening of NaCl single crystal. It is found that event energy spectra are highly sensitive to the stages of deformation, releasing high-amplitude acoustic-emission as the deformation proceeds, and the more complex micromechanisms are associated with the transient stage. The energy of acoustic-emission estimated in conjuction with the dislocation energy. The calculation showed that in an acoustic-emission dislocation of 160 cm in length which amounts to about $4\times10^5$ dislocation loops proves to be engaged. In addition, a correction factor for two-sensor acoustic-emission monitoring system has been proposed.