Applied regions of gradation index for traditional soil and water loss intensity and limitations of gradation index for urban soil and water loss intensity in Shenzhen city were generally expounded.

The ecological construction of urban soil and water loss plays an important role in urban (sustainable) development.

Linyi city is taken as an example to analyze the damages caused by the urban soil and water loss,which include destroying the land resource,polluting the water resource,destroying ecological environment and so on.

This article put forward four problems which are deserved to be discussed and clarified in research of urban soil and water loss.

Utilizing observed data and analytical methods of time domain and frequency domain in periodic autoregressive model AR(2),the water and soil losses intensities of major observation stations or points in Gansu Province are forecasted The two kinds of forcasting results are analyzed optimally It shows that the results of analytical method of frequency domain are more close to the observed dat

On the basis of a definition of urban soil and water loss, the paper made a preliminary study on its types and intensity gradation of the Pearl River Delta, which aims at revealing the essence and laws of urban soil and water loss, ensuring for the scientific and standardized classification and gradation in urban soil water l.

Study on urban flows intensity of large urban agglomerations in Northeast China;

This paper considers that urban flows intensity describes the contacts among cities,and it is the quantitative index of the function of urban service.