Results There were significant differences in T stage, N stage, pathological grade, race, ER, PR, HER-2, molecular subtyping and prognosis between the bone metastasis group and non-bone metastasis group (Z=-5.71, -2.39, -13.87, χ2=14.55, 305.74, 245.56, 69.34, 335.36, 79.15, all P<0.050), while patient age, gender and position of primary tumor presented no significant difference (χ2=0.57, 2.71, 0.45, all P>0.050). The result of Logistic regression analysis showed that ER positive, PR positive, advanced T stage and advanced N stage were independent risk factors of bone metastasis in breast cancer patients(OR=1.775, 95%CI: 1.258-2.505, P=0.001; OR=1.425, 95%CI: 1.236-1.643, P<0.001; OR=1.095, 95%CI: 1.043-1.149, P<0.001; OR=1.396, 95%CI: 1.246-1.564, P<0.001), while advanced pathological stage indicated lower risk of bone metastasis (OR=0.815, 95%CI: 0.733-0.907, P<0.001). The overall survival showed a significant difference between the bone metastasis group and non-bone metastasis group (χ2=133.53, P<0.001). In patients with bone metastasis, there were significant differences in T stage, N stage, pathological grade, patient age, ER, PR, HER-2, molecular subtyping, primary tumor surgery, chemotherapy and radiation therapy between death group and survivor group (Z=-7.75, -3.22, -8.14, χ2=39.80, 69.81, 87.45, 51.87, 132.47, 36.24, 6.05, 36.24, all P<0.050). The multivariate analysis of Cox proportional hazards model showed that patient age, T stage, N stage, PR, HER-2, molecular subtyping, pathological grade, chemotherapy, radiotherapy and primary tumor surgery were independent factors affecting the prognosis of breast cancer patients with bone metastasis(HR =1.349, 95%CI: 1.195-1.523, P<0.001; HR=1.151, 95%CI: 1.101-1.203, P<0.001; HR=1.077, 95%CI: 1.033-1.123, P<0.001; HR= 0.715, 95%CI: 0.626-0.817, P<0.001; HR=0.695, 95%CI: 0.627-0.770, P<0.001; HR=1.349, 95%CI: 1.260-1.414, P<0.001; HR=1.371, 95%CI: 1.261-1.489, P<0.001; HR=0.626, 95%CI: 0.562-0.697, P<0.001; HR=0.874, 95%CI: 0.791-0.966, P=0.008; HR=0.663, 95%CI: 0.561-0.784, P<0.001).