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coupled regional air-sea model is developed by using the regional climate model (P-σ RCM)and the regional ocean model (POM), which is used to simulate East Asian monsoon and oceanic elements in East Asian coastal waters. The simulated surface layer oceanic elements are basically consistent with the reality and can reflect the interaction between the monsoon and the surface layer currents. The great difference with the reality is "cold drift" of the simulated surface temperature. The coupled model hascertain ability to simulate the atmosphere geopotential height fields, precipitation and low-level southwest wind from May to August in 1998. It can display the process of summer monsoon onset during the third dekad of May and the evolution features after the onset. The differences between the simulation results of the coupled model and that of the single P-σ RCM are shown mainly in the low-level atmosphere and the model internal regions.