Experimental result shows that,under magnetic field the comprehensive load capacity can be improved greatly and composite wear value of the ferrofluid can be increased by 1.

The relative carrying capacity of land resources, relative carrying capacity of economic resources and synthetic carrying capacity of resources of Pearl River drainage area have been calculated from 1986 to 2002.

The ideas and methods about relative carrying capacity of resources were introduced in this paper,the relative carrying capacity of land resources,relative carrying capacity of economic resources and synthetic carrying capacity of resources of Chongqing City from 1991 to 2003,have been calculated,their evolutionary have been described.

The study results showed: 1,The contributions of the synthetic carrying capacity of land were greater than that of economy resources.

The relative carrying capacity of land resources,relative carrying capacity of economy resources and comprehensive carrying capacity from 2000 to 2005 are calculated and their changing processes were investigaled.

This paper, on the basis of rethinking resource carrying capacity, reconstructs the concept of comprehensive carrying capacity of regional land and resources with new visual angle and discusses the indicator system and methods of evaluating the comprehensive carrying capacity of regional land.

The carrying bodies such as resource,ecological environment and infrastructure et al of urban agglomeration have been overloaded and the comprehensive carrying capacity of urban agglomeration has been threatened.

Selecting Jiangsu Province as a study case where has fast socio-economic development speed and prominent man—land contradiction,the paper established the evaluation indicator system of comprehensive land carrying capacity from the four supporting systems including water and land resources,economy and technology,society,and eco-environment.