本文为拟薄水铝石工业产品的质量指标——三水氧化铝杂晶相含量、拟薄水铝石结晶度和平均晶粒度,提供了三个X光衍射测定方法.前两个方法均用外标法,其中第一个方法S_r(重复标准偏差)为0.2%,I_r(重复相对偏差)为3.0%;第二个方法S_r为0.5%,I_r为4.2%.第三个方法采用测量衍射峰积分宽的方法,数据处理过程有很大简化,S_r为1 A,I_r为2%. This article provides three X-ray diffraction methods for the determination of the quality index of the boehmite industrial product, the miscellaneous crystal phase of alumina trihydrate, the degree of crystallinity and the average grain size of pseudo-boehmite.The first two methods The first method was S_r (standard deviation of repetition) was 0.2%, I_r (repeat relative deviation) was 3.0%; the second method was S_r 0.5%, I_r was 4.2% .The third method The method of measuring the integral of the diffraction peak is wide, and the data processing is greatly simplified. The S_r is 1 A and the I_r is 2%.