The main aim of this research was to explore the factor structure of risk sources and the dimensions of perceived risk by consumers inB2C E Commerce, and investigated the impact of the risk factors on the perceived overall risk.

This essay analyzes the risk source of risk Investment Company, promotes Investment Company to make rational decision and controls risk effectively.

On the basis of the principles of general risk analysis,technique risk origin & conse- quence in development of naval vessel are explored thoroughly with the help of parallel development of subsystem on the vessel and the Mid-risk-High-risk transition principle in this paper.

Based on two factors of the biggest amount of spill oil and the environmental sensitivity in the water area of spill oil,environmental risk sources of facilities adjacent to water area in Jiangsu oilfield were assessed and classified.

In order to enhance risk management,this paper mainly explores 13 possible risky areas during the process of equipment acquisition,and analyses are made in greater detail into the risk sources in each risky area.

Based on several common construction methods of metro stations,risk sources are put forward and classified as pit engineering sources and structural engineering sources,respectively.