Based on time-and spatial-resolved measurements of plasma emission spectrum by pulsed Nd YAG laser ablation of copper in argon was analyzed. The experimental results show that plasma emission spectra were composed of atomic spectrum,ion spectrum and continuous radiation. The number and intensity of atomic spectrum was bigger and stronger than that of ion spectrum,the continuous radiation intensity was minimum,the atomic spectrum radiation region and duration were longer than that of ion spectrum,the continuous radiation region and duration were minimum. Combining with the temporal and spatial distribution spatial distribution species radiation intensity,the detailed mechanism of the generation of laser induced species radiation was discussed,the continuous radiation comes from the Bremsstrublung emission of energetic electrons ejected from the target and recombination of electron and ion near target,the primary mechanism of atomic excitation and ion excitation in plasma is inelastic collision between the elemental species and high-kinetic energy electron,the model can explain the experimental results qualitatively.