A new technique is introduced to prepare Ti or Ni coatings on diamond particle surfaces as metallic protection layers by the pulsed excimer laser deposition. Compressive strength and the surface form and structure of the uncoated and coated diamond particles are measured and analyzed by a compressive strength meter and a metallograph, respectively. Specific ingredients of the coated metallic films on the diamond particles are determined by X-ray diffractometer (XRD) as well. The test results show the compressive strength of the Ti-coated diamond particles increases greatly. Furthermore, because the energy of the plasma produced by using the pulsed excimer laser to ablate a metallic target is much higher, TiC film can be formed on the diamond particle even if the ambient temperature is not very high, which can enhance the interface bond strength between the diamond particles and the Ti films. The formation of this type of TiC film is very helpful to prolong the lifetime of diamond saws.