针对地震地电前兆观测，研制基于ARM9平台和32位模数转换器ADS1281的地电观测高精度数据采集系统，实现了高精度和低噪声采样。本文给出地电观测高精度数据采集系统的硬件设计、软件实现和系统指标测试结果。该系统采样率可设置为1次/秒至100次/秒，1至6通道任意配置，通信协议符合中国地震局地震前兆台网专用设备网络通信规程，可以满足地震地电传感器信号采集和网络接入需求。

To fulfill the requirements of earthquake precursor geoelectric observation，developed a high precision data acquisition system based on ARM9 platform and 32 bit A / D converter ADS1281. This system realizes high precision and low noise. This paper gives details on hardware design, the software implementation and test results. The sampling rate from 1 times a second to 100 times a second can be set and 1 to 6 channels can be configured. Communication protocol conforms to the Stipulation on Net Communication for Devices used for Earthquake precursor Observatory Network in China.