Abstract: With the development of the technology of petroleum products transportation, kinds of crude oil and finished oil act as non-Newtonian fluid. At present, the study of dynamics performance belongs to an active branch in the rheology. In this paper, the loop evaluation apparatus which is designed by ourselves for test fluid resistance is introduced. The fluid dynamics in loop of * 0 diesel which as the evaluation fluid in industry standard is tested. The relative fluid index which is taken as a dilatant fluid is confirmed.