Abstract: In this paper, relying on Ruijin three tunnels, carries on the monitoring gauging first in the construction process to the tunnel adjacent formation, then uses the EXCEL database and the Boltzman function to monitors the gauging data to carry on the fitting analysis.Analysis shows that The gauging result is more accurate, the curve fitting degree is also high, can reflect that well the tunnel in the construction process, the arch submersion and the level restraining displacement's change situation, is advantageous in the construction makes the correct judgment to tunnel's stability.