From the listing a few kinds of items, the relevance of the different characteristics of the detection results, how to search for analysis from complex test results of the relevance of different characteristics was explained, and extended to the analysis using different methods or instruments for testing items of the same characteristics (comparison method). The technology strengthened the internal quality control, quality inspection institutions laboratory, ensured accurate, reliable and efficient detection results, and its important applications guided product research and development, provided reference for standard laboratory internal quality control and result evaluation.