１９５９年北京城大水距今４０年了。现在，北京城市的建设虽然发生了很大变化，其地表径流及河道行洪特征随着城市发展也更加突出。去年我国南方和东北又发生了特大洪水。所以重新回顾北京城４０年前的洪涝灾害及原因，对做好当今北京城市防汛抗洪工作，有着重要的意义。１雨 1959 Beijing city flood 40 years ago. At present, although the construction of Beijing’s city has undergone great changes, the characteristics of surface runoff and river discharge are more prominent along with the urban development. Last year, another big flood hit south and northeast China. Therefore, it is of great significance to review the floods and causes in Beijing 40 years ago and do a good job in flood control and flood fighting in Beijing today. 1 rain