The analysis results demonstrated that the managemental factors were crucial factors leading to the occurrence of safety accidents. Ineffective management of mechanical leasing companies directly leads to the occurrence of accidents, and the management factors of other companies indirectly lead to accidents. It is observed that the chain reaction and interaction among the influencing factors, such as the lack of control, accumulation of problems, and insufficient safety redundancy, are the primary reasons for the occurrence of safety accidents.The occurrence of safety accidents is caused by the action of one factor, and is often the result of the chain reaction of two or more factors [11,12]. The direct causes of accidents are relatively clear, while the indirect causes involve a wide range of factors and their causal relationship often appears among various factors, and the weight of each factor varies.