Because of the great change of exposed geological condition and the expansion of geological faults range beneath 6#-10# lock chambers of Xiajiang Water Control Project after its base excavation,the original design of seperated lock chambers structure has been inappropriate.The design has to be altered.By comparison,the inergrated struture design is chosen as the final edition.This design can minimize the effect of geological faults to the stability of lock chamber structure and ensure the safety of chamber structure.