Laser-induced plasma spectroscopy of Fe target in air is investigated. Time and space-resolved spectra in the wavelength range of 380.0-420.0 nm are measured at different laser pulse energies. Under the model of local thermodynamic equilibrium,electronic temperature of Fe plasma is deduced to be around 104 K with assistance of Saha equation. Electron density of Fe plasma is obtained to be about 1017 cm-3 by use of the full-width at half maximum (FWHM) of Fe spectral lines. Spatio-temporal evolution,electron temperature as well as electron density near the target are presented.