Element concentration and dispersion are decided by atom structure of the element(internal cause)and geological process setting(external cause). Gene profile curve of geochemical elements is geochemical response result of the geochemical system to geological ore formation. The copper and tin polymetallic belt of the central-south Da Hinggan Mountains in Inner Mongolia was selected as the study area. The 1:200 000 stream sediment survey data were processed and analyzed. Based on the result, this paper discusses the structure and the generation of the gene profile curve of geochemical elements. The elements sequence structure information contained in the quasi gene profile curve of geochemical elements generated from stream sediment survey data, such as space-time structure and correlation structure, and its important geological significance are discussed in detail. Based on an integrated analysis of quasi-gene profile curve of the geochemical elements in the study area, the authors point out that the superposition of two epochs of mineralization resulted in the formation of large- and medium-sized polymetallic deposits. This conclusion indicates the orientation for further geological prospecting in this area.