Abstract: Bronze-Sm₂O₃/epoxy-modified silicone composite coatings were prepared through spraying method by using epoxy modified silicone and bronze & Sm₂O₃ as adhesives and pigments, respectively. The effect of heat treatment temperature and heat treatment time on the appearance, microstructure, near-infrared reflectivity, infrared emissivity, and mechanical properties of the as-prepared coatings were systematical investigated. The results indicate that the maximum withstand temperature of bronze-Sm₂O₃/epoxy modified silicone composite coatings can reach 300℃. After heat treatment at 300℃ with 5 h, the appearance and microstructure of the coatings are almost the same. The emissivity and near-infrared reflectivity at 1.06 μm can be as low as 0.590 and 57.4%, respectively. The mechanical properties remain intact. The hardness, adhesion strength, and impact strength can be maintained at 4 H, 1 grade, and 50 kg·cm, respectively. The prepared coatings can be used long-term at 250℃. After heat treatment at 250℃ with 100 h, the appearance and microstructure of the coatings remain unchanged. The emissivity and near-infrared reflectivity at 1.06 μm can be as low as 0.558 and 59.3%, respectively. The mechanical properties remain intact. The hardness, adhesion strength, and impact strength can be maintained at 4 H, 1 grade, and 50 kg·cm, respectively.