In this thesis, we study the formation of recording marks on crystalline Ge2Sb2Te5 phase-change nano thin film. We use an atomic force microscopy (AFM) and optical pump-probe system to investigate the topographic change and optical-thermal dependence of marks formation. From the experimental results, the process of recording mark formation is well studied in both incident power and pulse duration aspects. Through the complete experiments, the arbitrary pattern of recording marks can be written on phase-change material precisely by changing layered structure and tuning incident power and pulse duration. The special thermal-optical effect of phase-change material can be applied to the nano photonics in future.