Based on full-year floating lidar observations collected in 2023 in the nearshore region of the northern South China Sea, wind resource characteristics and data reliability within the 50-300 m height range were systematically analyzed. The main results are as follows: (1) Data availability exceeds 90% below 300 m and is higher than 99% between 50 m and 200 m. Comparisons with ERA5 reanalysis data at 100 m show correlation coefficients greater than 0.75 for both wind speed and wind direction, indicating high observational reliability. (2) Within the 100-300 m height range, the annual mean wind speed increases from 7.06 m·s-1 to 7.57 m·s-1 with height, while the annual mean wind power density increases from 357 W·m-2 to 435 W·m-2. (3) Wind speed distributions are well described by the Weibull function, with scale parameters increasing from 7.97 m·s-1 to 8.54 m·s-1 and shape parameters remaining stable between 2.19 and 2.21. (4) The wind shear exponent within 100-300 m is approximately 0.059. At the 15 m·s-1 wind speed bin, turbulence intensity ranges from 0.06 to 0.075, indicating a typical low-turbulence offshore environment. (5) Using a single 10 MW offshore wind turbine as an example, the theoretical annual energy production at a 150 m hub height is approximately 4.235 × 10? MWh (about 4235 h). Under an engineering scenario with a comprehensive reduction factor of 0.8, the annual energy production is about 3.567 × 10? MWh (about 3567 h). The results indicate favorable prospects for wind energy development in the study area and provide a reference for high hub-height offshore wind development in the nearshore South China Sea.