Laser induced breakdown spectroscopy (LIBS) was used to ablate aluminum samples, and the influence of 1 064 nm and 532 nm lasers on plasma emission spectra were studied. The influence of different laser wavelengths and energies on spectral signal intensity were compared, it was found that 1 064 nm was more likely to excite non-metallic element spectral lines, while 532 nm was more likely to excite metallic element atomic spectral lines. The influence of different energies and wavelengths on signal stability were studied, it was found that short wavelength (532 nm) signals have better stability, with an average relative standard deviation (RSD) of 0.72 times that of 1 064 nm lasers. At the same time, the relationship between laser wavelength and spectral energy level difference has been studied, and it was found that the relative intensity of spectral signals generated at 532 nm and 1 064 nm is negatively correlated with their energy level difference. Appropriate selection of laser wavelength and energy can effectively improve signal sensitivity and stability.