In order to protect the system of fiber Bragg grating (FBG) and keep its sensing performance on a high score, an adhesive-free bond which is considered as the alternative for epoxy adhesive technology is demanded. An electroless Ni-P plating process without coarsing for fiber Bragg grating was presented. With this plating method, the FBG was coated with a metal clad of Ni-P. By Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS), X-ray diffraction (XRD) and Temperature vibration tests, the composition, structure and adhesion force of the plating coatings were analyzed. And the results indicate that the coating is smooth, flat and compact. The solder ability of Ni-P clad was tested by welding the FBG into metal components, and the results reveal that the coating films can meet the requirements of an adhesive-free bond.