Laser paint removal mechanism is studied by analyzing the morphology and element composition of the ejected particle coming from nanosecond Nd∶YAG pulse laser radiation. The scanning electron microscope results show that the micro-/nano-particles, web-like aggregates are produced respectively in the process of laser paint removal. Micro- particles have irregular shapes and rough surfaces while nano- particles exhibit spherical and smooth surfaces. The average sizes of micro-and nanoparticles become larger as the laser energy increase. The energy dispersive X-ray spectrometer results indicate that the components of micro-particles are the same as the bulk material, related to the vibration removal mechanism. However, the content (atomic fraction) of C element for nanoparticles decrease seriously, more than 50%, resulting from the effect of laser ablation to paint. The research provides a new idea and method for studying the basic physical mechanism of laser paint removal.