Silver triangular nanoparticles were prepared by irradiating silver seed colloid with controlled PH at room temperature. The surface enhanced Raman activity and the time stability of asprepared silver triangular nanoparticles were investigated by experiments. The comparative analysis results of transmission electron microscopy images, UVvisible spectroscopy and Surface Enhanced Raman Scattering (SERS) spectroscopy of asprepared sample and sample deposited for 5 months in dark room at room temperature show that the geometric shape, size and maximum absorption wavelength of deposited sample are essentially unchanged, which indicate that asprepared silver triangular nanoparticles have better time stability. And the deposited sample exhibits strong SERS activity for rhodamine 6G molecules.