This paper analyzes the key points of quality control of sea dike in seepage prevention and sealing process adopted different construction methods of island-island connecting and island-land connecting after sea-based artificial island reclamation.The effect of high-pressure jet grouting pile sealing and seepage prevention at sea is contrasted with the effect of steel sheet pile on land.The result is the effect of the steel sheet pile sealing and seepage prevention is superior to jet grouting pile.