Based on investigation of landscape characteristics and test of middle large scale geochemical exploration methods in forest swamp areas within Northeast China, the authors studied some theories and methods for ore prospecting, such as characteristics of landscape geochemistry, modes of occurrence of elements and mechanism and factors affecting their migration and concentration, and media, granularity and methods for sampling. Some regularities governing secondary geochemical dispersion and enrichment are summarized, and some geochemical exploration methods are suggested for this area.