In the present work,silver nanoparticles(NPs)were deposited on nickel hydroxide nanosheet(NS)arrays by pulsed laser deposition(PLD)for surface-enhanced Raman spectroscopy(SERS).The effective high specific surface area with more silver NPs decoration was revealed by field-emission scanning electron microscopy(FESEM)and transmission electron microscopy(TEM).The microstructure and optical property of this three-dimensional(3D)substrate were investigated by X-ray diffraction(XRD)and UV-vis spectra,respectively.Using rhodamine 6G(R6G)as probe molecules with the concentration down to 10-5M,the Ag/Ni(OH)2 composite film exhibits very high enhancement ability and good reproducibility.It has been found that the enhancement ability of the substrate was strongly dependent on the size and interparticle distance of Ag NPs.In addition,3D structure of Ni(OH)2 NS arrays and charge transfer of Ag NPs may be responsible for this high sensitivity Raman phenomenon.