In order to study the effect of sample temperature on the characteristic parameters of laser-induced copper plasma, Cu sample on heating stage was excited by a single pulse laser to form plasma, and the corresponding plasma emission spectra of brass were obtained by changing the sample temperature. The intensity change of the characteristic spectral line corresponding to the change of sample temperature was analyzed, and the evolution rule of electron temperature and electron density with time at different sample temperatures are obtained by using Boltzmann equation and Stark broadening under the assumption of local thermodynamic equilibrium (LTE). At the same time, the cause of the radiation enhancement of laser-induced metal plasma was also discussed. The results showed that, given the same delay time, the higher the sample temperature is, the stronger the spectral intensity is, and the higher the electron temperature and electron density are. It is indicated that the resulting spectral intensity can be increased by increasing the sample temperature appropriately.