Abstract: Due to the significant water converging corridor effect during the construction of a long tunnel, groundwater continuously
converge into the tunnel axis during construction, a series of hydro-geological disasters have been induced, which have caused
incalculable losses to construction workers and ecological environment around the tunnel area. In view of this, considering the
differences in individual cognition levels in group decision-making on the basis of system construction of mountain highway tunnel
construction on the groundwater environmental disturbance evaluation, an analytic model based on decision makers' preference
information is used in the field of environmental impact assessment of groundwater around the tunnel area, and the model is also
combined with fuzzy comprehensive evaluation method. The groundwater environment of Tibetan Mila Mountain Tunnel is evaluated
using this combined method. Results show that the disturbance degree of groundwater in the construction of Mila Mountain super-long
highway tunnel is in a general level. With the evaluation results, corresponding construction measures have been taken in the course of
the tunnel construction so that environment protection around the tunnel area can also be implemented. This provides a useful
reference for the tunnel EIA of groundwater in similar regions.

Key words: tunnel construction, groundwater, environmental impact assessment, preference information, interval number analytic model