中文摘要：

地球化学元素测量数据中含有噪声，影响了圈定地球化学异常的准确性．本文率先采用人工免疫系统（AIS）对地球化学测量数据进行降噪，在此基础上确定地球化学异常，并绘制了异常等值线图．通过对西藏恒星错测区1：50000水系沉积物测量数据的处理，验证了人工免疫系统在地球化学数据降噪中的实用性和可靠性．圈定的异常基本上消除了各类假异常，使主致矿异常更加突出，更加显著地反映矿化体的分布，尤其是得到的异常与恒星错斑岩铜钼矿完全叠合，甚至映射了斑岩铜钼矿的边界和形态特征．

英文摘要：

The noise of geochemical elements in survey data decreases the accuracy of the determination of geochemical anomaly, and have drawn the anomaly isopleths graph. By processing the survey data from 1 ： 50000 hydrographic deposits in Hengxingcuo of Tibet, this article indicates the availability and reliability of using Artificial Immunity System （AIS） in the noise reduction processing on geochemical anomaly. This anomaly formed clear morpha with high intensity. The circle anomaly eliminated most kinds of error anomaly, made the main mineral anomaly prominent, and reflected remarkably the mineral body distributing. Especially the anomaly completely overlapped the porphyry Mo and Cu in Hengxingcuo, and, to some extend, mapped the boundary and the morpha characteristics.