Abstract: There is a wide shattered fault zone composed of F1, F107 and f100 faults in the foundation of a hydropower plant. The fault zone lay cross foundation section 10th to 13th and base section 3th to 5th of power houses. Study has been done for reinforcement of the fault zone. Based on the experience from similar projects at home and abroad, the measures such as concrete plug, long-hole grouting, antiseepage wall and thick curtain were used to reinforce the foundation. At the same time, the structures and power house founded on the fault zone were joined together to enhance integrity and stability of the dam.