This paper introduced a new measurlng system, using water as a king of even distributed load, for measuring of relative deflection of heat insulation sandwich plate which widely used in cold stores. The results show that the accuracy of measurements by means of the system sufficiently approaches to 10-4. Approsal has been raised for modifica-tion 0f the Standard of ZBX99003- 86 and JB/T6527- 92.