Geological work in search for ore deposits is difficult in wide forest and swamp areas of Heilongjiang Province. In this paper，the prospecting work in order of ultra-low and low density (1 site/100 km2)→very low density (1 site/16 km2)→low density (1 site/km2)→high density (18 site/km2) geochemical investigation was carried out according to the strategic thought of rapid control of overall situation and gradual reduction of the prospect area by using the MOMEO method. The results are satisfactory in part of the prospect area, as shown by the discovery of some PbZn ore deposits both in shallow places and in depth. The combination of effective geochemical methods is thus very useful in search for ore deposits in forest and swamp areas.