In this paper the amendment of No.18 pile in 19th pier of Citong Bridge in Quanzhou city is presented. There is a soft layer 6.41m thick in No.18 pile,a site cast concrete pile,due to breakdown of guide tube during casting. Amended by consolidation grouting, the pile stood up to tests. The construction technology, adopted steps and test method were introduced. It can serve as reference to similar engineering.