Abstract: This paper takes Sandaocundong Station of East Extension Line of Changchun Metro Line 2 as an example, using such methods as numerical simulation method, dynamic curve analogy method, frequency analysis method and BP neural network method to predict the possible maximum water level in the next century. The prediction results of groundwater depth from four methods are 2.0m, 2.31 m, 2.05 m and 2.13 m respectively. The monitoring of pore water pressure shows that there is no reduction of pore water pressure in this station. The final buried depth of up-floating water level is 2.0 m and the up-floating water level is 257.2 m.