提出了一种公路交通参数检测器的设计方案。检测器分为检测模块与处理模块两部分 ,利用 L C并联谐振电路与锁相环工作原理 ,设计了基于单片计算机的检测模块 ;根据检测器的性能要求 ,设计了基于单片计算机的处理模块 ,完成对数据的采集、处理、存贮与传输。本检测器具有实用性好、抗噪声与防串音能力强、工作稳定度高和易于实现联网工作的优点 Proposed a road traffic parameter detector design. The detector is divided into two parts: the detection module and the processing module. Based on the working principle of LC parallel resonant circuit and phase-locked loop, the detection module based on single-chip computer is designed. According to the performance requirements of the detector, a single-chip computer processing module , Complete the data collection, processing, storage and transmission. The detector has the advantages of good practicability, anti-noise and anti-crosstalk capability, high work stability and ease of networking work