Freedom is man s first essence , which is the most important differene between man and animal .

The article introduces the basic principle of causes and effects tracing analysis and seeks each kind of reason in the coal mine casualty,the author through the typical casualty that occurs in the coal mine enterprise,discovers the foundation reason the indirect reason and the essential reason which the accident occurs,clearly showed in the method of fishbone chart.

Research on the Normative Nature and Functioning Mechanism of Audit Committee;