Public lighting energy waste is particularly serious in our country. In the library reading room of university,all the lights turn on all day long,which causes much unnecessary waste of resources. A energy-saving control circuit was de-signed,which switches the light according to the light level and the number of students in the reading room. The circuit simula-tion was performed. The system works well. It is expected that the system design can play an assistent role and guiding function of improving the theoretic teaching and practical teaching in electronic major. According to the experiment,the students can inte-grate the knowledge they have learned,and then their ability of problem-solving is improved. It is beneficial for more students to promot the design philosophy and method.%我国的公共照明设备的电能源浪费现象非常严重，以学校图书馆借阅室的照明灯为例，几乎常年、整天的照明造成大量的电能源浪费。结合电子专业的技术知识，通过设计电路图以及对电路图的仿真，并应用相关电子元器件，设计出一个节能控制电路，根据当日的光照水平和阅览室内学生人数，决定照明灯的开关，实物运行效果良好。
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