The Kuqa Depression of the Tarim Basin developed lacustrine-swamp depositional environments during the Jurassic period and fan delta-shore-shallow lacustrine environments during the Cretaceous period. While both coal-derived and lacustrine oils have been discovered in the Dawanqi area of the Kuqa Depression, previous studies lack a comprehensive understanding of tricyclic terpane distribution patterns in mixed-source oils from this region. Due to the relatively light nature of the crude oils from Dawanqi Oilfield, the oil samples were first separated into saturated and aromatic hydrocarbon fractions. The saturated hydrocarbons were then treated by complexation to remove n-alkanes, followed by GC-MS analysis. Finally, quantitative assessment of mixing ratios in the mixed oils was conducted using coal-derived and lacustrine oils as end-members. Results reveal distinct characteristics among different oil types: coal-derived oils show a tricyclic terpane distribution of C₁₉TT > C₂₀TT > C₂₁TT > C₂₃TT > C₂₄TT > C₂₅TT, with high C₂₄TeT/C₂₆TT ratios and very low C₂₈TT and C₂₉TT contents; lacustrine oils exhibit C₁₉TT < C₂₀TT < C₂₁TT < C₂₃TT > C₂₄TT > C₂₅TT distribution, with low C₂₄TeT/C₂₆TT ratios and moderate C₂₈TT and C₂₉TT contents, mixed-source oils display C₁₉TT > C₂₀TT > C₂₁TT <C₂₃TT > C₂₄TT > C₂₅TT distribution, with intermediate C₂₄TeT/C₂₆TT ratios and moderate C₂₈TT and C₂₉TT contents. While the mixed-source oils share distribution patterns with both end-members, their other geochemical parameters fall between those of the two typical crude oils, indicating their mixed origin. Quantitative modeling of mixing degrees suggests that coal-derived oil contributes approximately 55% ~ 90% to the mixed-source oils. This study not only provides a model for oil-source correlation and quantitative determination of contribution ratios in mixed-source oils from the Dawanqi Oilfield but also offers valuable geochemical insights for the exploration and development of different oil types in this region.