Abstract: How to determine and trap the geochemical anomalies from a large number of original data reasonably and how to find the geochemical information related to mineralization have become the core problems in the data processing of exploration geochemistry. In this paper, the authors processed the 1:50000 regional geochemical data of Nylonma area with the geochemical field method. Some conclusions have been reached: ①The delineation of geochemical anomalies by using the geochemical field method not only takes into account the anomalies of high background areas but also reflect the weak anomalies in low background areas, and this has certain guidance significance in search for blind ore bodies.②Compared with the conventional method, the geochemical method used can reduce the anomaly range and reflect the mineralization anomalies more accurately.