In this study, the authors examined the relationship between monthly sea level data and concurrent large-scale monthly mean aea level pressure and SST data for 1960 to 1990, which are reasonably well simulated by present day climate models; sea level variations due to variations of regional atmospheric forcing and oceanic circulation , are not adequately simulated by a global climate model because of insufficient spatial resolution. The authors applied a statistical “ down scaling” strategy to sea level along the Chinese coast. Two interrelatad processes were identified . One process is the local wind or wave set-up of water due to Asian monsoon wind anomalies ; the other is the rainfall diluting effect in spring. At interdecadal time scale . the later becomes more important and most likely plays a major role in the planetary scale atmosphere-ocean interaction taking place in the eastern North Pacific. In this study, the authors examined the relationship between monthly sea level data and concurrent large-scale monthly mean aea level pressure and SST data for 1960 to 1990, which are reasonably well simulated by present day climate models; sea level variations due to variations of regional atmospheric forcing and oceanic circulation, are not adequately simulated by a global climate model because of insufficient spatial resolution. The authors applied a statistical “down scaling ” strategy to sea level along the Chinese coast. Two interrelatad processes were identified. One process is the local wind or wave set-up of water due to Asian monsoon wind anomalies; the other is the rainfall thinning effect in spring. At later time more more important and most likely plays a major role in the planetary scale atmosphere -ocean interaction taking place in the e astern North Pacific.