According to the status quo of farmland utilization of Hubei Province from 1995 to 2004,this paper analyzes the major problems in terms of farmland ecological safety,and then puts forward countermeasures to guarantee farmland ecological safety,such as establishing a warning system,making some ecological payment,doing land arrangement,and so on.

On the cultivated land security problems of Chongqing municipality;

This paper analyzed the concept of cultivated land security,then put forward the method of calculating cultivated land s safe baseline.

At present,Northwest of Guangxi was facing with several major problems in terms of the cultivated land security.

Based on the understanding the features of land ecological security in Poyang Lake Region,the evaluation model of land ecological security in Poyang Lake Region was set up and was used to grade the security degree of 11 counties in Poyang Lake Region.

Based on having good understanding of the concept and theory of land ecological security,this paper mainly established the indicator system of land ecological security evaluation of small town in the east of China,which including 24 indicators and in view of economical and social safety,urban environmental security,rural environmental security and utilization of resources in urban and rural area.

This paper firstly analyzes the connotation of land ecological security and its three categories.

Based on the ecological security theory,the theory and methods of evaluation of ecological security of tourist destination is studied.

The concepts of cultivated land ecounit and cultivated land niche are proposed based on niche theory.

The author firstly puts forward some concepts about cultivated land ecounit and cultivated land niche,and expounds its object,essence,types,chatacteristic and development law based on niche theory.