The enrichment process of ore- forming materials is a key problem facing ore geology researchin the coal- hosted critical metal deposits. Numerical simulation linking pressure, heat transfer, fluid- flow and chemical reaction processes is conducted to quantitatively describe the enrichment process of Ge within the Lincang coal- hosted Ge deposit, Yunnan, China. Modeling results are consistent with previous research, verifying the metallogeny of coal- hosted Ge deposits and the effectiveness of numerical modeling approach within ore geology research. The morphology of the upper surface of intrusions is a key factor controlling the enrichment process of ore- forming materials, and intrusions with dome upper surface results in 9.1×103 times of the concentration of Ge compared to the concentration of Ge participating in chemical reaction. With half the size of intrusion, the enrichment rate can still approach 6.9×103. However, intrusions with depressed and flat upper surfaces can only lead to Ge enrichment of 589 times and 9.3 times, respectively. Therefore, intrusions with dome upper surface can boost the generation of high- grade Ge mineralization within the coal basin, which can provide useful information for future deep prospecting and exploration of coal- hosted Ge deposits with magmatic- hydrothermal origins.