Abstract: Experiments were performed, with the method of density match in a terrestrial environment, to study the migration and interaction of drops with different diameters in matrix liquid under temperature gradient field. Thermocapillary migrations for both single and double droplets are observed via shadow method. For double droplets migration experiments, it can be observed that small droplet always moves faster than large droplet for different types of oils. The results indicate that there exist horizontal movements for both small and large droplets, and the large droplet has larger extent than small droplet.