Abstract: In the metal and nonmetal underground mine production, the most common accident is the roof fall accident, according to a mine accident case as the basis, through the comprehensive analysis of metal mine roof fall accident cause analysis, combined with the actual work experience, using the fault tree analysis method (FTA), identify with the cave-in. Various factors between causal and logic relation, and a variety of factors to make qualitative analysis, put forward the corresponding preventive measures. The metal mine to realize safe production has certain guiding significance.