Abstract: Application of Hadamard transform in nuclear magnetic resonance (NMR) imaging enhances the sensitivity of NMR imaging. In this paper we explained the principle of line scan Hadamard transform NMR imaging and deducted the relation of Hadamard cede to the phase of excitation signals. We obtained phase table of synthesis frequency excitation signal. The Hadamard transform NMR imaging using spin echo was discussed in details.