Yb-doped photonic crystal fiber femtosecond laser amplification system is used as the processing light source, and nanostructures are produced from copper thin films by laser induced forward transfer (LIFT) technique. Metal films composed of different nanostructures can be obtained by controlling the parameters of femtosecond laser source. Nanoclusters are produced under lower power, and their sizes grow bigger with the power increasing. Then nanowire structures appear when the power rises to a certain level. Some physical processes of the interaction between femtosecond laser and materials are analyzed by experiments. On the basis of the mechanisms, experimental results of copper thin films with three different thicknesses of 20, 40, 200 nm are compared under the same experimental conditions. According to the results, optimum parameters are obtained for the generation of nanoclusters and nanowire structures.