In the process of laying the man holed piles foundations of main buildings for works Vc of Dongjiang pharmaceutical factory,the water retaining capacity in 11 man holed piles was so high that the construction was difficult,in addition,due to high pumping rate,the ground subsidence occurred and the construction was forced to stop temporarily.According to the problems stated above,the man holed piles were restored and the foundation of other buildings was changed into a shallow laying,then the high pressure jetgrouting was used to consolidate the underlying soft formation,with a good result.