Analysis technology of beta-phase transformation of nickel sulfide which was collected from the origin of spontaneously fractured tempered glass has been quantitatively (and qualitatively) studied by the micro-Raman spectrometric method. Point analysis by means of the micro-Raman spectrometer has elucidated the crystallographic information from alpha-phase to beta-phase of the nickel sulfide. The mapping analysis using confocal micro-Raman spectrometer has provided us the quantitative analysis of the degree of beta-phase transformation of the nickel sulfide, newly. The quantification of the degree of beta-phase transformation enabled the calculation of the coefficient of volume expansion of the nickel sulfide accompanied with the beta-phase transformation. The analysis technology by micro-Raman spectrometric method is very useful for the following problems. 1) Quick presentations of quantitative information for the investigations of the causes of spontaneous breakage of tempered glass in the glass markets. 2) The quantitative information for the optimization of the thermal history (temperature and processing time) condition in the Heat Soak Test. 3) Quantitative analysis of the process performance in the current Heat Soak Test.