本文用突变理论讨论了交通阻塞行为。一条公路上,确定车流阻塞的特定条件—临界车流密度、临界车速、临界车流量,一直是交通工程学的研究课题。本文讨论了这些临界值,探讨了它的基本方程,并用一个实例说明实变模型对大扰动引起的阻塞行为比渐变理论(例如流体力学模型)的分析更接近于实际。 In this paper, the catastrophe theory is used to discuss traffic congestion. On a highway, it is always a research topic in traffic engineering to determine the specific conditions of traffic jam - critical traffic density, critical speed and critical traffic volume. In this paper, the critical values ​​are discussed and their basic equations are discussed. An example is given to show that the real model is more realistic than the gradient theory (eg, hydrodynamic model).