Abstract: Based on the data of marine ecological monitoring areas over the years, ecosystem health status and biodiversity of typical marine ecosystems in China from 2004 to 2020 are analyzed. The results showed that 12 of the 20 typical marine ecosystems are in sub-health status, and 7 are in health status, Among the 8 coral reefs, mangroves and seagrass beds ecosystems, 7 were in healthy condition, and 1 were in sub-health status. The ecosystem of estuaries and bays showed a trend of improvement, The results showed that the ecosystem of the Yellow River Estuary, Yangtze River Estuary, Pearl River Estuary, Jinzhou bay and Laizhou bay has changed from unhealthy to sub-health, the ecosystem of coral reef, mangrove and seagrass bed has fluctuated in recent years, which reflects the management effect of major river basins and Bohai sea in China, but the improvement is mainly from "unhealthy" to "sub-health", The grim situation of marine ecological environment protection has not changed.