We have investigated Sm1+xBa2-xCu3O6+δ (SmBCO) films deposited by pulsed laser deposition technique using stoichiometric and Sm-rich SmBCO (x = 0.08) laser targets. In the SmBCO films deposited using the target of x = 0.08, the critical current density (Jc) at 77 K with zero applied field was obtained 4.3 MA/cm2 at film thickness of 1.1 μm. To study the pinning mechanism of SmBCO films, we investigated the magnetic field (0 ∼ 9 T) dependence of Jc for x = 0 and x = 0.08 films. From this result, we found the different behavior of the Jc between x = 0 and x = 0.08 films. We examined the difference of pinning mechanism from the scaling law and the microstructure of film using transmission electron microscopy.