Abstract: To study the influence of cast steel material non-uniformity on the mechanical performance of cable saddle, based on probability theory and finite element numerical simulation technology, a random simulation program of PYTHON material was compiled on the ABAQUS platform, and a random finite element model considering the cast steel material non-uniformity was established. The complex stress and plastic distribution of cable saddle under three-way load were discussed in depth, and the influence of cast steel material non-uniformity on the ultimate bearing capacity of cable saddle was analyzed. The results show that the reduction of grid size will lead to the increase of randomness of bearing capacity, but has little influence on the determination of bearing capacity. The randomness of steel casting materials will lead to uneven stress distribution of steel castings, and local areas will enter the plastic state under the design load. The non-uniformity of material yield strength has a great influence on the bearing capacity of the structure, while the non-uniformity of elastic modulus has a small influence on it. The material inhomogeneity of the steel casting has no obvious influence on the static mechanical behavior of the cable saddle, but it will reduce the bearing capacity of the structure slightly and make the structure appear greater deformation in the limit state.