Abstract: The differential level measurement technology used in land nuclear power plants (NPPs) cannot be directly applied in the measurement of steam generator (SG) water level of floating NPPs because of the long-term inclination and swing condition. In this paper, combined with the principle of liquid level measurement by differential pressure, SG water level measurement improvement scheme for floating NPPs is proposed based on theoretical calculation and analysis. This improvement scheme was tested and verified by inclination and swing test bench. The related experimentation verifies that this improvement scheme can track the water level under various working conditions and get the accurate water level under inclination and swing condition.