SEES from 0-phenanthroline, 2, 2 -bipyridine and their complex ions adsorbed on colloidal silver particles have been observed for the first time. The result provides an experimental evidence for the opinion that the 200 cm-1 band is related to the N-Ag bond vibration. Comparisons between Raman spectra of the molecules and those of their complexes are made, and some new phenomena are found. Combining with other experimental results (electron microscope photograph, transmission spectra), analyse and explanations are given for these phenomena.