自动水满报警器是当今运用十分广泛的报警器产品，在消防部门，公司安全和人们的日常生活都发挥着重要的作用。该电路设计方法颇多，但其功能都是唯一的，实现水满后自动报警，而工作原理，分析方法，电路调试等都根据具体电路而定，所以对电路工作原理分析和电路安装与调试处理技术犹为重要。本文从自动水满报警功能出发设计了一个功能较为完善的电路，并对电路工作原理和元件参数选择处理进行了系统的分析，根据工作原理和调试的结果，从所存在的一些问题着手解决，改变电路结构和元件参数，进而更准确地制作完成电路功能。

　　-　　Nowadays, automatic water annunciator is used extensively.It plays very important role in fire engine department, company security, and our daily life. There are many ways to design its electric circuit, but it has only one function that it alerts when water is full. Work principle, analysis, depend on the concrete electric circuit, such as adjustment of electric circuit, which is very important to analyze the electric circuit work principle, install, adjust and processing electric circuit. We　have designed a more perfect electric circuits based on function of automatic water annunciator and analyze systemically the work principle of electric circuit and selection of component parameter. According to work principle and results of adjustment, there are still some problems. We have solved the problems, and changed the component parameter,and made its electric cirtuit accurately.