任何事物的结构形态变化时都会导致其功能的变化。某些生态系统中一些要素的存在方式发生较大变化，就要引起要素之间的关系发生巨变，从而破坏生态环境，造成人员伤亡、财产损失等。不同种类的灾害通过相互联系和相互作用而构成具有一定结构、功能、环境和特征的系统。 Changes in the structure of any thing will lead to changes in its function. In some ecosystems, some elements of the existence of a major change, it is necessary to cause the relationship between the elements of a great change, thus undermining the ecological environment, causing personal injury, property damage and so on. Disasters of different kinds form a system of certain structure, function, environment and characteristic through mutual contact and interaction.