In order to better understand the enhanced Raman signal dependence on the separation between two nanoparticles,a chip for the mechanical controllable break junctions as well as high stability setup was fabricated.With such a device,two sharply tip-shape nanoelectrodes were obtained automatically after the breaking of the nano metal wire,and the gap size between the two nanoelectrodes can be adjusted in pico-meter accuracy during the Raman spectroscopy measurement.Furthermore,the third electrode was introduced based on the two tip enhanced Raman scattering.The effect of the electrode position on the Raman signal intensity was investigated.The experiment results demonstrate that the signal intensity is strongly dependent on the alignment of three nanoelectrodes,and the introduced third electrode can enhance the Raman signal further,supplying the theory investigation for the enhanced mechanism.