Abstract: The existing verification regulation of JJG 1055-2009 and GB/T 28766-2012 standards of performance evaluation can not fully meet the needs of measurement performance examination for natural gas on-line chromatographic analyzer, and some items in verification regulation and evaluation standard have some limitations in the practical application. This paper compares the performance of existing verification procedures and evaluation standards provisions of the assessment of the project. Combined with the actual needs of online gas chromatography using the system, the validity, reproducibility, resolution and the consistency of analysis results of the 4 calibration items are put forward. The feasibility and applicability of the evaluation items in the calibration specification are verified by an example.