In order to analyze the structure stress and the current density distribution on the pulsed reactor in the course of working, the test on the stress was designed. The hoop stress on both the edge and the center of copper belt was obtained by the resistance transducer. The stress result was validated by calculating the thick wall cylinder model with the inflation pressure. To calibrate the stress value, the copper belt coil with a ballonet inside was designed. The half-bridge circuit, electrical grounding of the bridge cases and shielding wires were designed and put in practice to reduce the pulsed electromagnetic interference. The disturbance generated by the parasitic resistance and the stray capacitance was reduced by electrical grounding of the bridge cases. The experiment results show that the hoop strain is larger than the axial strain, the strain on the edge is larger than the strain in the center. Reinforcement should be applied on the edge of the copper belt. And it can be speculated that the current density on the edge is about 1.2 times near the center.