The HeBei Province is located in northern China,according to it's geographical location and climatic characteristics,it should be dominated by the drought.In 38 years of the Republic of China,however,floods actually was more than drought,why? In this paper,through a simple analysis,we should find: the occurrence of floods were mostly due to the heavy rain,the river breached barrier ruined.Except the topographical conditions of HeBei,monsoon climate characteristics,the distribution of rivers conditions and other natural factors,the main reason was that the water-bank didn't repair,the forest was destructed,embankments have been caused by vandalism.These factors were due to political instability,wars and other conflicts caused by age.Therefore,disaster prevention is not difficult,as long as the country's stability,focusing on water conservancy construction and the protection of the natural environment,many disasters can be avoided.