对寨底地下河系统北部区域进行示踪试验,确认了北部区域的地下水分水岭边界。进一步对示踪试验数据进行详细分析,推测得到从投放点G06到排泄点G16、G20之间的地下水连通介质结构,其中G06～G16段以管道介质为主并发育一条支道和一个以上溶潭,G16～G20段含水介质则以裂隙为主。最后依据投放量、最大检测浓度等建立相对浓度系数概念,并用于分析比较G06至G16、G16至G20两段不同含水介质条件下的地下水流的径流集中程度。 A tracing test was conducted on the northern part of the underground river system in the Walled City to confirm the groundwater watershed boundary in the northern region. Further analysis of the tracer experiment data was conducted, and it was presumed that the structure of groundwater communication medium between the discharge point G06 and the drainage points G16, G20 was presumed. The G06 ~ ​​G16 sections mainly consisted of the pipeline medium and developed one branch and more than one dissoluber , G16 ~ G20 section of the aqueous medium is mainly cracked. Finally, the concept of relative concentration coefficient was established according to the dosage and the maximum detection concentration, and used to analyze and compare the concentration of groundwater flow in two different water-bearing media G06 to G16 and G16 to G20.