Abstract: The spectrometer based on linear optical detector has the advantage of multispectrum channel detection and it plays an important role in massspectrometry. The wavelength calibration for the spectrometer is discussed. A concept of using laser induced breakthrough atomic spectrum to enrich characteristic wavelength spectrum for wavelength calibration is put forward. A concave grating spectrometer, a 2048 elements CCD and a low voltage mercury lamp were used to carry out laser induced breakthrough spectrum test with 5 samples, such as Cu, Al, Mg, Ca and Si. The selected 10 laser induced atomic spectrum wavelength data and the 10 characteristic spectrum lines achieved with mercury lamp were used to recalibrate the wavelengths of the grating spectrometer. The feasibility of the concept is effectively validated.