With the harmonic output 532 nm of a pulsed Nd·YAG laser as radiation source, the emission spectrum of laser induced nickel sample plasma was investigated. Most emission peaks of the spectrum were assigned to NiⅠand NiⅡ. The electronic excitation temperature and electron density in the plasma was measured. They were 3 714 K and 4.67×1016 cm-3 respectively. The spatial distribution of the temperature and electron density were measured by moving the detection head of a fiber along the direction parallel and vertical to the laser beam. It showed that the emission intensity of the plasma in the centre was most strong. With the measurement points moving apart from the center along the direction vertical to the laser beam, the emission intensity decreases, but both of the line profile and width of the emission spectral was almost invariable. So the electronic excitation temperature and electron density in the plasma was uniform along this direction. While along the direction parallel to the laser beam, the temperature and electron density were not uniform. They took the maximum value at the position about 1.5mm apart from the sample. We ought to collect the emission spectrum of this position when perform relative investigation with the technique of LIBS. This can ensure higher detection sensitivity.