本文提出了一种基于MCU的电子产品过期失效的算法。该算法可实现系统使用期限的控制,包括密码获取、系统激活、系统倒计时三个部分,详细介绍了其实现过程,并给出了相应的源代码。为电子产品添加该算法模块能更好地使产品推广试用以及有效地解决客户欠款问题,给产品开发者带来更大的经济效益。 This paper presents an algorithm based on MCU expired failure of electronic products. The algorithm can realize the control of the system life span, including the three parts of password acquisition, system activation and system countdown. The implementation process is introduced in detail and the corresponding source code is given. Adding the algorithm module to the electronic product can better promote the trial of the product and effectively solve the problem of customer arrears, and bring more economic benefits to the product developer.