The work aims to study the evaporation process of nanofluids on curved surface at different substrate temperature and analyze the heat transfer and flow characteristics of droplets in the evaporation process, to reveal the evaporation mechanism. Five kinds of copper hemispheres with different surface temperature (15, 30, 45, 60 and 75 ℃) were selected as the evaporation substrate, and the droplets containing Al2O3 nanoparticles were used as the evaporation fluid. The variation process of various parameters (contact angle, contact triphase line and residual volume of droplets) in the process of droplet evaporation was recorded, and the deposition patterns formed after evaporation were measured and analyzed. The evaporation rate of droplets on curved substrate was greater than that on planar substrate. At different evaporation temperature, the droplet evaporation modes were basically the same, and the contact lines slipped during the evaporation process, and the reduction rate of contact angle was greater in the second stage. With the increase of substrate temperature, the coffee ring narrowed significantly, the Marangoni number increased obviously, and the evaporation rate accelerated. Therefore, the curved substrate strengthens the convective heat transfer inside the droplet compared with the planar substrate, and nanofluid evaporation patterns are independent of temperature and curvature. The convective heat transfer effect inside the droplet in the later stage of evaporation is stronger than the surface heat dissipation effect, and the influence of Marangoni effect on the formation of coffee ring increases with the increase of substrate temperature.