Abstract: Some underground garage deep hole excavated for building foundation project in Suzhou, ground situation for Suzhou typical soil layer, the biggest cutting depth is 5.25m with the drill hole filling pile supports and protections watering soil to stop the water curtain to carry on the supports and protections.This project is planed originally to completes the hole excavated for building foundation part before March, 2011, but in order to snatch the progress, construction and so on only then carries on the underground garage the peripheral high-level housing construction to 10 strata times excavating.In July, 2011 when excavates the underground garage hole excavated for building foundation, in the guard stake wall flank appears the horizontal direction crack, also the development is rapid, third days on the development are 10cm, latter decided to use the steel pipe braces & high-pressure jet to carry, after process processing, the dangerous situation was under the control, has avoided a bigger loss.