A system for laser-induced breakdown spectroscopy (LIBS) is provided. The system for the LIBS includes a laser module generating a first pulse laser and a second pulse laser. An optical delay device incident by the second pulse laser is used to increase an optical path of the second pulse laser. A Kerr medium incident by the second pulse laser generates a time gate, and allows a plasma light beam generated from a sample incident by the first pulse laser, passing through the time gate and being output at a time point. A detection device receives and measures the plasma light beam output at the time point to generate a signal. A processing module connected to the detection device detects a signal, and compares the signal with a data base to obtain information concerning a composition and element concentrations of the sample.
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