According to natural disasters and the type of disaster, natural disaster system can be divided into three types.

The first category, single disaster system. Refers to a natural disaster events caused by various disaster damage caused by the direct disaster loss, indirect disaster loss, the sum of the loss of derivative damage. Many natural disasters can cause one or more secondary disasters, thus forming a disaster chain system. Mainly has the drought disaster system, the typhoon disaster system, the earthquake disaster system, the flood disaster system.

The second category, single - class disaster system. Refers to a kind of disaster affected by natural disasters caused by direct disaster damage, indirect disaster losses, the sum of the loss of derivative damage, that disaster chain disaster system. Such as housing damage to a damaged machinery and equipment damage caused by a mechanical equipment downtime, shutdown - shutdown, stop production and then into the impact of life and production losses and so on.

The third category, regional disaster system. Refers to a region in a period of a variety of natural disasters caused by a variety of disaster victims damage caused by direct disaster losses, indirect disaster losses, the sum of the loss of derivative disaster, that disaster group disaster system.

Source: Atlas of China's Natural Disaster System