车头时距分布和到达分布是交通流理论中两个重要的分布。对同一交通流，这两种分布是互相对应的，这种对应关系是很有实用意义的。但由于具体的时距分布的对应到达分布不易推出，至今仍缺乏这方面系统的论述。本文试图做此工作。 The headway distribution and arrival distribution are two important distributions in traffic flow theory. For the same traffic flow, the two distributions correspond to each other, and this correspondence is of great practical significance. However, due to the specific time distribution of the corresponding arrival distribution is not easy to launch, is still a lack of systematic discussion in this area. This article attempts to do this work.