| The history of agricultural natural disaster is closely related to the development of agricultural production. Ancient China saw frequent occurrence of agricultural natural disaster and its serious harm and damage to the agricultural production and economy. The study of agricultural natural disaster in the new historical trend needs absorption of theoretical results and review of measures and effect of development of the disaster and its reduction in ancient times. The thesis, consisting of three chapters, studies the agricultural natural disaster and reduction strategies during Zhou, Qin, Han and Jin dynasties.Chapter I, the introduction of history of agricultural natural disaster research, discusses the aim and significance of the disaster research and reviews the academic research in this field, also puts forward a new research approach and system of agricultural natural disaster.Fruitful achievements have been made in agricultural natural disaster research thanks to much concern and support from many departments concerned.Yet many fields in the research need to be expanded due to historical limitation of the researcher. This paper, guided by theory for modern disaster, expounds the academic history of disaster research and its achievements, analyzes problems in the research and proposes solution and approach to the problems.In view of standard confusion in the material processing of agricultural natural disasters in history, disaster scale grading of historical disaster materials is put forward according to disaster degree theory in modern disaster science and establishes the standard for grade I. disaster. Based on this, disaster grades of historical agricultural natural disaster is to be determined on the basis of relevant historical information of the disaster area, actual situation and duration.The disaster history involved in the paper is divided into two stages according to its development characteristics, respectively are Zhou, Qin, West and East Han dynasties and Wei, Jin, South and North dynasties. The former is the important stage for developing traditional agriculture. The scale of the agricultural natural disaster, components, actual situation, reduction plan and thoughts are all in the changing period. Wei and Jin dynasties last a short period while experience the important shift of agricultural natural disaster from the north to the south..Chapter II, agricultural natural disaster during Zhou, Qin, West and North Han dynasties, discusses happenings of agricultural natural disaster and reduction measures and analyses disaster characteristics and reduction achievements.Chinese agricultural natural disaster system came into being mainly in Zhou, Qin, West and East Han dynasties. The period witnessed occurrence of all kinds of agricultural natural disasters and serious damage to agriculture. The disaster centered on mainly in summer and autumn with Shanxi and Shandong the two worst regions. The disaster was not evenly distributed through the year.Many technological measures have been used in agricultural disaster reduction fields with certain effect in the development of traditional agriculture. Furrow irrigation system, farming irrigation project, the Yellow River conservation project etc. played an active part in relieving floods and droughts. Progress of farming techniques diminished droughts, plant diseases and insect pests, weeds and other harms to some extent. Some physical, chemical and biological techniques were also applied in the practice of biological disaster alleviation.To diminish and prevent disaster, ancient governments established policies of natural disaster preparation and disaster relief. For example, rich contents of policies for disaster preparation and relief in chapter 10 of Zhouli, a book about Zhou_dynasty, formed the basis for the system. The construction of grain storehouse for natural agricultural disaster, relieving the people in stricken areas, opening up virgin soil after disaster and inspection of relief work comprises the basic system of an...
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