[Objective] The specific sources of sediment in Shuanghe reservoir were quantitatively studied in order to provide scitific references for the comprehensive management and sediment source research of the river basin in the northwest of Yunnan Province.[Methods] This paper selected the Shuanghe reservoir catchment of Jianchuan County as the study area. Proposed sediment sources were woodland, grassland, farmland and coal land, which were analyzed for their respective contribution to the reservoir sediment by using a combined fingerprinting technique. Twenty-seven geochemical factors were selected, the best combination of fingerprint factors was confirmed by the conservation test and Kruskal-Wallis H test. Then, the contribution rate of each sediment source was calculated by using the multivariate linear mixing model.[Results] ① A total of 8 fingerprint factors (S, Ca, Sr, TP, Cr, Ba, K, Mg) was confirmed to be the best fingerprint factor combination, with the cumulative contribution rate of 89.60%; ② The total contribution rate of sediment was grassland (37.28%), farmland (34.62%), woodland (27.86%) and coal land (0.24%); ③ The descending order of sediment contribution rate per unit area was farmland (9.55%), grassland (3.78%), coal land (1.24%) and woodland (0.38%).[Conclusion] The combined fingerprinting method is applicable to the identification of sediment source in the Shuanghe reservoir basin. Cultivated land is still the land type with the most severe soil erosion, while grassland is the land type with the high sedimentation, due to its large area and low surface coverage.