Abstract: To study the structure of rare earth complexes of rutin and antibacterial activity, with the rare earth metal lanthanum (III) chloride and rutin as the raw material, combined with ethanol solution, then the lanthanum-rare earth complexes of rutin turns out. Use the DMSO as the solvent and scan the rutin and its complex’s wavelength among the range of 200 ~ 400nm by UV spectroscopy, then the two characteristic peaks are found red shifting and blue shifting respectively. And the fourier infrared spectral analysis of the complex shows that the characteristic absorption peak ,appears in the 614.88 cm-1, indicating that the complex combined with rare earth lanthanum (III) and rutin in the form of La-O bond. The result agrees with analysis of ultraviolet-visible (UV) absorption spectrum.At the same time, the study of fluorescence properties of the complex shows the complex has a strong correlation of the changes of fluorescence intensity at pH5~7 with the concentration among 2×10-5 mol?L-1~2×10-9 mol?L-1. Antibacterial activity tests shows that lanthanum - rutin complex is superior to the antibacterial activity of rare earth lanthanum (Ⅲ) ion and rutin ligands.The complexes have a strong antibacterial activity in antibacterial textiles.

Key words: rare earth anthanum-rutin complex , synthesis , fluorescence property , antibacterial activity