The standard for quantitative analysis of α-quartz phase by X-ray diffraction has always been YB/T 172-2000.The revised standard will be adopted on April 1,2021.The comparison of the standard before and after revision shows that when the content is ≤5.2%,the absolute error before and after revision is ≤0.10；When the content is >5.2%,the absolute error before and after revision is >0.10;and the absolute error increases with the increase of the content.The revised standard has well inherited and developed the technical requirements of YB/T 172-2000.It has strong operability,high accuracy,good repeatability,and it is more convenient and fast.The diffraction intensity value of the sample can be directly substituted into the working curve to obtain the analysis results.