Abstract：To improve the signal to noise ratio of laser-induced breakdown spectroscopy,a relation between the signals of laser-induced breakdown spectroscopy and the delay time was discussed in theory. The tests on the GBW07716 synthetic limestone certified reference samples with laser-induced breakdown spectrometerwere conductedand the changes in such lines as Ni I 305.432 nm,Ni I 313.411 nm and Ni I 351.505 nm with the delay time were analyzed. The results showed that the changes of spectral lines with delay time were mainly closely related with the life of energy level instead of the transition probability Aij. When delay time surpassed 2 μs,the spectral lines emitted from the same high level exhibited the same trend along delay time,while the spectral line transited from different energy levels to the same lower energy level showed discrepancy in their changes with delay time.
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