Based on the conductivity tomography technique, the laser cladding conductivity tomography equipment is designed to quickly present the conductivity distribution of the cladding layer for analysis of structural changes.The molten clad material 304 stainless steel was used as the object of study, and the designed conductivity tomography imaging equipment was used to test the molten clad layer of 304 stainless steel to compare and analyze the detection of the molten layer of 304 stainless steel with different number of electrodes, excitation measurement mode and temperature change, and to verify the feasibility of the detection method.The results show that the measured voltage data have low fluctuation and high stability in the case of 16-electrode, interval excitation reference measurement mode;The super-resolution image reconstruction algorithm is capable of accomplishing the identification of different shapes of the molten cladding layer with high accuracy of the reconstructed image;Compared with the room temperature region, the heating region of 304 stainless steel cladding layer electron movement speed up, conductivity distribution changes significantly, the conductivity of significant differences occur.