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L1- norm regulation method is applied in the seismic spectral- inversion technique��which verified the feasibility in broadens spectral range and increased resolution of seismic data�� Besides��the sparsity of L1- norm regulation solution and the instability by using rectangular window have been discussed in detail�� The authors pres- ent an algorithm of auto- picking window length to do the calculation��and calculate one seismic trace model by the algorithm�� Spectral- inversion technique effectively broadens spectral range and increases resolution of the reflection survey��and provides a new thinking in recognizing thin layers and more complicate seismic survey��