NaOH was used to adjust the pH of the solution in the synthesis of nanostructured Bi2Te3 alloys via hydrothermal and solvothermal process. However, it is still elusive whether NaOH is necessary and how it affects on the size and morphology of Bi2Te3 which contributes a lot to the thermoelectric figure of merit ZT. The present work suggested that bulk quantity of nanostructured Bi2Te3 with considerable uniform morphology of nanoflake could be yielded without NaOH when the reaction time ranged from 6 h to 48 h. These nanoflakes have about 10-30 nm thickness and 50-300 nm width. When adding NaOH, the morphology of Bi2Te3 becomes various.