In atmospheric environment, the laser plasmas was generated by the ablation of Ni target by using a 532 nm pulsed Nd:YAG laser beam. The spatially-resolved emission spectrum of Ni atom in the laser induced plasma was measured in the wavelength range from 350 nm to 600 nm. The spatial-evolution of the Stark broadening of the Ni 385.83 nm emission spectral line and its radial distribution were also obtained. The electron density of plasmas was calculated from the measured intensity and Stark broadening of emission spectral line, the spatial evolution property of the electron density was discussed. It is shown that Stark broadening (line broadening and line shift) of the spectral lines and electron density increased to its maximum firstly, then decreased along the direction of laser beam when the distance of the measured zone from the target surface was in the range of 0～2.5 mm. The maximum value of Stark broadening of the spectral line and electron density appear at 1.25 mm from the target surface. The value of electron density changes in the range of 0.1～3.0×1016 cm-3.