Abstract: Long straight rod bundles are electric-heating-simulated fuel assembly with primary structure. When electric circuit is exerted on rods, attraction and repulsion effects are generated in rod bundles. To ensure use feasibility of simulated fuel rods, experimental research on attraction and repulsion effects on electric heating 9 rod bundles was carried out with high-speed camera in detail. Visual experimental results show that rod offset occurs when imposing DC electric fields on rod bundles. As electric voltage is 85 V and electric current is up to 450 A, the maximum offset of rod bundles is approximately 1 mm. The magnitude and direction of rod bundles to offset change when DC electric current shifts. AC electric current also exerts influence on attraction and repulsion of rod bundles, less significant than that of DC electric current.