we report an the electrochemical controllable growth of the shape and the orientation of crystallites of the Ag dendritic nanostructures without any template，surfactant directed. It can be observed that silver dendrites were obtained in a large quantity and good uniformity by a simple electrochemical route. In thesilver dendrites，the diameter of the trunk is around 100 nm with its length up to 16 μm，the length of thebranch can reach 3 μm. And the crystal structures for the truck and branches in the silver dendriteswere characterized by selected area electron diffraction(SAED). Furthermore，we also investigatedthe effects of the growth conditions art the morphology of silver dendrites，especially the growth tendency ofAg dendrites at different controlled temperature. The results show that experimental temperature play an important role in the formation of Ag dendrites hierarchical struatrue during the electradeposition process，Thetemperature range of 25-26 ℃ is suitable for the formation of silver dendrites. This may be due to the fastgrowth of silver Ag dendrites was affected by ions diffusion speed in the electrolyte. In addition，we alsoinitially irtvestigsted the interesting hierarchical structure of the Ag dendrites used as SERS substrates.
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