In traditional theory of signal and system, the relationship between single side Laplace transformation and Fourier transformation exists faults. The theory from this paper overcomes these faults.

• 摘要在传统的信号与系统理论中，单边拉氏变换和傅氏变换关系存在瑕疵。文中给出的单边拉氏变换和傅氏变换关系的理论克服了传统理论的瑕疵。