<正> This paper presents our work on the rheological properties of the solution of polyaniline（PAn） in N-methyl-2-pyrrolidone （NMP）. The result s indicate that the solution’s non-Newtonian property becomes more prominent with the increase in solution-oncentration

exhibiting the behavior of pseudo-plastic fluid. Besides

there is a critical concentration C.（around 0.06 g/ml）

beyond which the viscosity of the PAn/NMP solution takes a suddenincrease. With temperature rising

both the viscosity and the thixotropy of the solutiondecrease

implying that there exist physical cross-linking interactions between the molecularchains in the solution.