Abstract:The comparison method of water flow standard facilities was introduced. The electromagnetic flowmeter with superior performance was selected as the transfer standard to realize the comparison of water flow standard facilities. It introduced the test method of the stability of transfer standard, and expounded the detailed technical requirements in the process of comparison test. Finally, based on the comparison data of all participating laboratories, the comparison results were expounded, and the evaluation and cause analysis were carried out. Combining with many influencing factors of water flow facilities in the verification process of electromagnetic flowmeter, the data curves of various laboratories were comprehensively compared and analyzed, and the possible influencing reasons were found out.The matters needing attention and suggestions for improvement of water flow standard facilities were given.