电子计数器测频有两种方式：一是直接测频法，即在一定闸门时间内测量被测信号的脉冲个数；二是间接测频法，如周期测频法。直接测频法适用于高频信号的频率测量，间接测频法适用于低频信号的频率测量。本文阐述了用数字电路设计了一个简单的数字频率计的过程。-Electronic counter measuring frequency in two ways: one is the direct frequency measurement method, that is, in a certain gate time measurement of the measured signal pulse number　2 it is indirect frequency measurement method, such as cycle frequency measurement method. Direct frequency measurement method for high-frequency signal frequency measurements, indirect frequency measurement method used in low frequency signal frequency measurements. This paper expounds the digital circuit design with a simple digital frequency plan process.