Abstract: In this paper, 2-year measured wind speed data in the Northern South China Sea is applied to analysis the adaptability of various wind spectrum models under different wind speeds. The results show that the wind spectrum model recommended by API coincides better with the observed wind spectrum in the northern South China Sea. While in the high wind speed condition, the API spectrum value is lower than the measured wind spectrum value in the low frequency region. Meanwhile, the measured data is used to modify the parameters of API wind spectrum model, and modified API wind spectrum is improved in the low frequency region. The research results of this paper can provide a reference for ocean engineering design in the South China Sea, and give a support for the study of wind spectrum in the South China Sea.