Safety control is one of the most important prerequisites for major projects, which are typically influenced by multiple factors and involve multiple control objectives. This paper proposes a multi-objective safety control method with analytical and traceability features using belief rule base(BRB). Firstly, multiple BRBs are constructed for multiple safety objectives. Secondly, the contribution degrees of factors to each safety objective are calculated. Thirdly, a comprehensive list is formed of key factors according to the contribution degree for multiple objectives. Finally, the multi-objective optimization is carried out using only the key factors. A practical case of tunnel construction is studied with two safety objectives, namely the settlement and the building tilt rate. Case study results show that the proposed method can accurately identify the key factors and effectively reduce both the settlement and the building tilt rate. In addition, the influence of the number of key factors on the safety control process and results is also further explored.