为提高水色卫星遥感数据的质量并实现遥感定量化应用目标，卫星传感器精确的辐射定标是重要前提和关键。采用南海PY30-1平台上观测的水体与大气光学特性参数，通过反射率基法对Aqua卫星上MODIS传感器的可见近红外波段进行替代定标。结果表明，定标增益因子与MODIS国外研究结果非常接近，除443 nm波段偏差较大外，相对差异均小于5%。证明在海上利用反射率基法进行替代定标是可行的，能够给出精确的替代定标增益因子。

In order to improve the quality of ocean color satellite remote sensing data and achieve quantitative applications, the accurate calibration of satellite sensor is the key. By using the water and atmospheric optical parameters measured in the South China Sea PY30-1 platform, we have carried out the vicarious calibration of Aqua satellite′s moderate-resolution imaging spectroradiometer (MODIS) sensor by reflectance-based method. Our results show that the calibration gain factor is very close to the MODIS research. In addition to 443 nm band, the calibration gain factor relative deviations were less than 5%. This study shows that the reflectance-based method can be applied to the China Sea, we can get the accurate calibration gain factor.