This paper analyses the design requirement of the micro dot printer of taxi counter firstly, gives the chart of hardware structure, analyses the method of software design. At last, it gives the software flowchart. 本文首先分析了出租车计价器微型打印机的设计要求,给出了微型打印机的硬件框图,分析了微型打印机的软件设计方法,最后给出了软件流程图。