By using multivariate data analyzing theory to set up mathematic model, and forecasting the engineering accidents automatically in time by computers through programming, it was testified by initial tests at the site that the system made up the deficiency of manual forecast and promoted the.

It is shown that the safety for concrete structures in the construction had become the key problem from the recent some engineering accidents.

And this paper puts forward some methods for preventing engineering accidents occurring in subgrade and foundation.

Based on the quality investigation of the on- site engineering accidents in well logging and drilling in Xianhe Production Plant of Shengli oil field in recent years, the analysis focuses on the main causes of the accidents, thus a series of preventive mea- sures are putting forth.

Perniciousness of the alkali-skeletal material reaction in the concrete according to the project accident;

From study some tupical project accident,analysed the cause fo failure of the structure and failure of the normal useage.

Through the re-analysis about the technical identification report of a project accident,the suitable standard of the identification works and the judging standard of hazardous buildings have been discussed.