文中介绍了热水器水温水位控制仪系统的整体设计，并简述了设计中各单元电路的工作原理。该设计用汇编语言在P87LPC762BN 芯片上编程实现.系统由水位检测电路、水温检测电路、键盘控制、单片机控制模块、执行电路、显示电路和报警电路构成，共同实现水温水位控制功能。单片机控制模块的设计是整个系统设计的核心，文中详细介绍了单片机控制模块的软件设计。本设计的特点是成本较低，性能稳定，精度高，有一定的开发价值。-This paper introduces the water heater temperature control system, the overall instrument design, and outlines the design of the modules of the working principle of circuit. The design used in assembly language programming P87LPC762BN chip. System from the water level detection circuit, the water temperature detection circuit, keyboard control, single-chip control module, the implementation circuit, display circuit and alarm circuit, a common achievement of the water temperature the water level control functions. Single-chip control module is designed to be the core of the entire system design, the article detailed the single-chip control module software design. This design is characterized by lower-cost, stable performance, high precision, a certain degree of development value.