Platinum group elements can be used to accurately depict the migration, enrichment, and trace elements in the mother material source. By examining the platinum group elements in magnesia-ultramafite copper nickel deposits, we can provide a comprehensive evaluation that offers direction and reference points for the evaluation and utilization of associated platinum group elements in copper and nickel ore. Methods: In this study, we systematically collected samples from the two largest ore bodies in the eastern and western parts of the mining area. We then analyzed the platinum group element content of the ore bodies. Through statistical analysis and simulation of a large amount of platinum group data, we were able to determine the PGE composition of the parent magma of the Baixintan deposit. Results: By simulating the differential crystallization process of R factor and sulfide, the R factor of the Baixintan copper-nickel sulfide deposit was found to be 115. Through a comprehensive analysis and comparison of the characteristics of platinum group elements in different ore deposits, it was determined that the rock mass was sourced from the mantle material, and that the metallogenic process was mainly controlled by the crystallization differentiation of the parent magma. Conclusions: （1）The Baixintan copper-nickel ore is mainly composed of massive, dense and sparse immersed ore, block ore and low-grade immersed ore bodies. The platinum elements in the block ore exhibit a significant abnormality in iridium, with iridium enrichment in sulfide melt. The content of sulfide melt is closely related to the enrichment, indicating that changes in ore type enhance the enrichment of PGE. Therefore, a comprehensive evaluation of platinum elements in bulk ore should be taken into consideration in the future. (2) Based on statistical and simulation calculations of a large amount of platinum group data, the PGE composition of the parent magma of Baixintan deposit was determined to be: Os = 0. 335×10-9, Ir = 0. 267×10-9, Ru=0. 277×10-9, Rh = 0. 144×10-9, Pt = 4. 94×10-9, Pd = 2. 32×10-9, Ni=338×10-6, Cu = 174×10-6. These values are an order of magnitude higher than those found in non-mineral rock masses. The PGE content is positively correlated with sulfide content, indicating that PGE is greatly affected by sulfide melting in magma mineralization. Additionally, the PGE diagram also suggests that the original magma originates from the loss mantle source area. (3) The characteristics of the original mantle standardization map of platinum group elements exhibit a similar distribution trend to that of Jinchuan copper and nickel ore. The Pt/Ir-Pt/Pt* diagram indicates that the Baixintan rock mass is primarily influenced by crystallization differentiation trends, which reflects that the late-stage metallogenic magma action is mainly due to crystallization differentiation.(4) By simulating the proportion of silicate melt and sulfide melt during the crystallization process, the R factor (ratio of silicate magma to sulfide) was calculated. Through the simulation of sulfide crystallization process, the R factor of the BaiXintan copper-nickel sulfide deposit was found to be an average of 115. This provides a detailed understanding of the migration and distribution of platinum group elements in the mother magma, which can further guide prospecting efforts.