Using ECMWF's numerical weather forecast products,weather charts and the real-timesurface observational data of nine stations along the southeast coast of China in Mar. from1993 to 1996,several factors of cloudy-rainy weather for several days,such as the distributionof physical parameter fields,the daily change of rainfall and the area of rainfall were analyzed. Results show that the land-sea high pressure is the most direct,visible and importantweather system in cloudy-rainy weather for several days,and its establishment and destruction are a unique weather pattern.