The method divides the whole volume of river water into four segments: environment water volume,safety water volume,risk water volume and disaster water volume.

Based on some concepts such as risk capacity of water environment etc.

Discussing the quality risk control of BT project based on the constructing way of Xing-Huai highuay;

Quality Condition of Trade and Quality Risk Control of Agrifood Trade;

Matter element assessment of engineering quality risk and application

In this paper, the value at risk (VAR) method used in the fields of financial risk assessment is introduced, the risk factors, threat, vulnerability, and assets are analized, and a risk quantification model and the method of calculating VAR are proposed.

The proposed method described risk quantification method by identifying and quantifying the significance of assets and the criticality of threats from the behaviors of entities,and designed trust computation methods based on the quantified risk.

On the problem in risk measure;

,a strict definition of risk,the mathematical description of risk and the risk measure index.

By means of factor analysis approach,ten essential risk variables are divided into four critical components and three types of influential factors.

The influence of the dependence of the risk variables each other on the economic outcome of an example has been analyzed.