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Based on the definition of concentration density (CD) and concentration period (CP), uneven distribution characteristics of warm extremes during Meiyu period over Yangtze-Huaihe region are analyzed by using data of daily averaged temperature from 1960 to 2007 and method of cumulating frequency threshold. Results show that the definition of CD and CP can do a quantitative description of the uneven distribution characteristics. The anomaly pattern of CP is uniformly south-north anomalies, while the pattern of CD is south-north and west-east anomalies. Furthermore, a comparison of configuration between the circulation and CP and CD anomalies shows that when the south-north anomaly of CP occurs, a"+-" anomaly mode appears over north Pacific. In addition, the intensity increases with the altitude, that leads to an equivalent barotropic structure. The sea temperature anomaly is located at the significantly …