There were no large-scale excavation conditions for the drainage culvert project of Fuqing nuclear power plant and the soil layer contained rubble and riprap, it was difficult for pile-forming and water stopping could not be realized. The combination application of high pressure jet grouting and curtain grouting water sealing technologies were explored for slope support and water sealing. It is proved that by the engineering practice, good results are achieved in construction speed, safety construction, civilized construction and economic benefit with these two methods, which can be reference to the future projects with similar geotechnical conditions.