Following the bottom-up technology, the flower-shaped nanomaterials consisted of nanobelts and nanowirs were fabricated on ITO-coated glass substrate by electrodeposition. The morphology of the as-prepared nano-flower was analized by FE-SEM. Moreover, the forming process was simulated. The results showed that the nano-flowers were fabricated through the two steps: first, nanowires formed gradually into nanobelts during the couse of thermal treatment; second, nanobelts contracted into nano-flowers. In addition, the conditions of thermal treatment played the determined role on the flower-shaped Bi₂Te_2.7Se_0.3thermoelectric materials.