The plasma plume photograph from pulsed laser ablation ofmetal Cu in the pressure of 12. 4kPa helium at-mosphere was taken, Spatial - resolved measurements of plasma plume emission spectra by pulsed laser ablation of metal Cu in helium were reported. The experimental resultsmay be explained using a simple model based on plume is made of three different ranges. In the ranges, the colour character and the ablation mechanism is different from one another, it can be used to explaine the experimental results successfully