Based on an analysis of natural disasters which occur in some major damage regions in Henan Province, China, including frequency of disasters, their objects and characteristics, this paper emphasizes the fact that many AgMDs are disastrous consequences resulting from Man's own doing. Considerable agricultural yield reduction over a vast extent of fields has always resulted from AgMDs, especially from droughts and floods occurring in areas of Henan Province.
These disasters are characterized using the concepts of synchronizing, overlapping, alternating, succesive occuring etc.. The new point of view of “natural disaster masses (or chains)”, “entropy addition” and the “systems analysis method” should be applied in analysing, understanding and preventing AgMDs.
In the last part of this article, some measures and proposals for preventing and fighting disasters are presented.