Time-sequence characteristics of the annual changes of the agricultural land use in China during the period 1980~2002;

Based on the value cost databases of the main crops such as paddy,wheat,maize,cotton,flue-cured tobacco,sugarcane and beet,this paper studied the changing characteristics of the agricultural land use intensity in China during the period 1980-2002.

Based on the cost-income data (1980-2002) of farm produce and the China Agricultural Yearbook, taking these main crops in the progress of the arable land use as a case study, this paper studied the regional differences in the changes of the agricultural land use in China during the period 1980-2002 from three aspects as the degree of intensity, the sown area and the abandonment of the arable land.

Townification,the process of rural population and resources moving into towns,is sure to exert profound influences on the utilization of agricultural land and cause a series of problems.

Land is the foundation of agriculture, and the utilization of agricultural land is essential to regional development.

As to the special relationship between farmland and the problems of agriculture, countryside and farmers, the core of social benefit of farmland utilization is to construct an evaluating index system involving the sustainable development of agriculture, the social .

The result showed: arable land marginalization would cause some outcome,such as: reduce arable land use income,reduce production value of the sowing industry.