The temperature distribution along the surface of drying droplet has significant influence on fluid flow and particle deposition of the droplet. Currently

the surface temperature distribution of the droplet is often studied by numerical methods. For drying droplets on finite thickness substrates

the effect of meshing on calculated surface temperature is discussed. Compared to the region near the droplet edge

mesh refinement in the central region of the droplet has negligible effect on numerical results. The influence of the size of mesh refinement region near the droplet edge on droplet surface temperature can also be neglected compared to the level of mesh refinement. By studying the effects of relative substrate thickness hR on droplet surface temperature

three different states with changing substrate thickness are found. (1) From center to edge

surface temperature increases monotonically. (2) From center to edge

surface temperature changes non-monotonically. (3) From center to edge

surface temperature decreases monotonically. The different patterns of droplet surface temperature can be explained by considering the combined effects of heat conduction path length and evaporative cooling. The surface temperature "phase diagram" on parameters (hR

q) with different relative thermal conductivities is obtained. The results will be helpful to understanding droplet evaporation and providing theoretical basis for evaporation induced self-assembly and ink jet printing.