The principle of inherent safety was quoted simply and accident cause occurred was discussed in this article.

The estimating indicator system of the civil aviation accident cause,which bases on the HFACS model is established.

Research on traffic accident causation also rest on traditional statistical method phases, in despite for ages.

Based on accident causation factors,different definitions and classification ways for hazard at abroad are summarized,such as hazard of energy unit,two categories of hazards and three categories of hazards.

Engineering safety evaluation methods based on accident-causing theory;

Based on the accident-causing theory and the analysis of the current situation of coal mine safety in our country,an coal mine accident causation model fitting for reality is established.

In order to probe the process of water traffic accident, investigation its causation which will help for the safeguard against risks, and to improve water traffic safety management, this paper analyses and compares varies of accident-causing theories, then on the basis of them, produced water traffic accident-causing theory, and gave a clear explanation of each of its factors.

Based on the characteristics of building construction,this paper studies detailedly the safety evaluation problems of construction by the accident-reason theory and system block diagram analysis method.