Abstract: The f5 fault and lamprophyre vein of Jinping Ⅰ Hydropower have an adverse effect to deformation stability and stress transfer of dam foundation. They can seriously affect the stability and safe operation of the dam. This paper investigates the cement grout problems for the f5 fault and lamprophyre vein. It is combined with its engineering geology. It examines the cement-chemical compound grouting technology from grouting materials, grouting method, and field grouting. It evaluates the grouting on the basis of mechanism of cement-chemical compound grouting. The results show that the use of grouting materials can be better irrigation. Construction technology and grouting parameters are reasonable. The permeability of rock has been improved. The wave velocity and deformation modulus of the f5 fault and lamprophyre have a certain degree of improvement. But they still do not meet the design requirements. Optimization proposal has been got from grouting materials, parameters and quality checks on the basis of the grouting evaluation results.