Abstract: A nuclear feedback simulation module adopting the point reactor neutron kinetics model with six delayed neutron precursor groups was proposed. A program which combines a nuclear feedback module with the thermal-hydraulic calculation model to simulate the natural circulation under rolling motion in Matlab platform was developed. The results show that the average flow rate and heating power decrease when considering the nuclear thermal coupling effect under rolling motion condition. The average value of the heating power decreases with the increase of the rolling frequency and rolling amplitude. The oscillation amplitude of the heating power increases with rolling period and rolling amplitude. Furthermore, the nuclear thermal coupling effect decreases the fluctuation amplitude of the fuel temperature, playing a positive role in suppressing the temperature fluctuations.