The laser induced breakdown spectroscopy (LIBS) spectra of the soil are measured in the visible spectral region. The main and some trace elements of the soil sample are obtained by the analysis and assignment of spectral structure and spectral lines respectively. Additionally, the intensities of Pb 405.78 nm spectral line are measured at the different concentration of Pb in soil. The LIBS calibration curve of the analytical spectral line is obtained by internal calibration, and the value of detection limit, 36.7×10-6, is obtained from the fit of the calibration curve.