CoPt 3 thin films due to their good magnetic properties such as perpendicular anisotropy and high coercivity, can be used in magnetic recording media with high-density data. Magnetic properties of the thin films depend on the condition of deposition such as substrate temperature. By control the condition, we can reach the desirable features. In this study, CoPt thin films was deposited by pulsed laser deposition (PLD) on PMN-PT, MgO, Al 2 O 3 , Quartz and Si substrates. The influence of parameters such as deposition temperature, film’s thickness, type of substrate and laser pulse repetition rate on the anisotropy and coercivity was investigated. Magnetic hysteresis loop of the films was measured using the magneto optical Kerr effect (MOKE). The thin films that was deposited on MgO indicated perpendicular magnetic anisotropy and significant coercivity. The maximum coercivity was found by deposition at 500 and 400 , which was equal to 4427 and 4037 Oe, respectively. Deposition on other substrates did not show perpendicular anisotropy. Also, CoPt 3 thin films on Si substrate shows metal-insulator transition, which may be due to the diffusion of Co and Pt in Si substrate and formation of a tri-metallic compound. In this study, anomalous Hall effect (AHE) was also measured for the thin film samples. The maximum anomalous Hall resistance of the samples was found to be about 1 .cm for film deposited on MgO at 400 and with the laser pulse repetition of 10 Hz. According to the structural studies, high Hall resistance of these samples is probably due to the formation of Co clusters in the matrix of Platinum atoms. Films with L1 2 tructure exhibited lower anomalous Hall resistance.