Abstract: The data products of the new-generation ocean color observation satellite show great application potential in numerous fields. Through the analysis of typical data products and application cases, validation of primary product accuracies, and evaluation of application effects, the marine monitoring application efficacy of this type of satellite was explored. Collaborative observation was enabled via a three-satellite constellation formed by the new-generation ocean color observation satellite, HY-1C Satellite, and HY-1D Satellite, achieving daily 100-meter or 50-meter medium-resolution remote sensing observation. The observation results show that the satellite's 2^nd generation ocean color and temperature scanner (COCTS2) achieves daily global ocean coverage observation with significantly enhanced spatial resolution of 500-meter nadir resolution, generating global 2-km gridded standard products. The satellite data efficiently support dynamic monitoring of marine hazards, including Ulva prolifera blooms, sea ice, oceanic internal waves, and coastal environments. The multi-resolution simultaneous observation payload configuration and remote sensing technology synchronously enable the dual application demands for large-scale coverage and high-precision monitoring. Significant application potential in inland water quality parameters and terrestrial vegetation information acquisition is also demonstrated by the new-generation ocean color observation satellite. The research findings and conclusions above provide references for assessing application efficacy, as well as social impact and economic value of the new-generation ocean color observation satellite data.