Abstract: Based on 238 rock samples and 4,931 soil samples collected from the Jiucheng-Jiemao area of Yingjiang County, Yunnan Province, and compared with other geological units, this paper is focused on the study of geochemical characteristics and sources of heavy metals in granitic magmatic rocks and soils as well as ecological risk assessment of soil heavy metals. According to the results obtained, the granitic magmatic rocks and Gaoligongshan group(Pt₁GL.)rocks have similar provenances or inheritances. The Pb content in the two kinds of rocks is higher than that in the upper crust, while the content of other heavy metals is lower. The soil heavy metal content and change characteristics of the Quaternary (Q^a), Mangbang formation (N₂m) and Gaoligongshan group (Pt₁GL.) are basically the same as those of the granitic magmatic rock, which are significantly lower than the Quaternary (Q^b) and Guanshang formation (D₁g). Combined with lithologic compositions, the soil parent materials of the Quaternary (Q^a), Mangbang formation (N₂m) and Gaoligongshan group (Pt₁GL.)may be mainly granitic magmatic rocks. The soil heavy metal values of the granitic magmatic rock and Guanshang formation (D₁g) are mainly affected by natural sources, and the influence of human activities is little. The geoaccumulation index and the potential ecological risk index indicate that the granitic magmatic soil has a low ecological risk of heavy metals and is a clean soil.The soil-forming parent materials of farmland with the production function of grain, sugar, vegetable, etc. in Dehong Prefecture are mainly granitic magmatic rock, but related study work is insufficient. Through comparative research, it is believed that Dehong Prefecture has great potential in developing green and pollution-free food production.