本论文设计一个基于单片机技术的数字频率计。首先，我们把待测信号经过放大整形；然后把信号送入单片机的定时计数器里进行计数，获得频率值；最后把测得的频率数值送入显示电路里进行显示。本文从频率计的原理出发，介绍了基于单片机的数字频率计的设计方案，选择了实现系统得各种电路元器件，并对硬件电路进行了仿真。-This thesis developed a single chip technology based on digital frequency meter. First, we tested the signal after amplification plastic　then the signal into the microcontroller' s timer counter to count years, were frequency value　the final frequency of the measured values into the display circuit to display. This principle of starting from the frequency meter, introduced the microcontroller-based design of digital frequency meter, the system was chosen to achieve a variety of circuit components, and hardware simulation.