Objective Tidal forces influence the form and scale of marine shelf deltas and the development and evolution of branch channels. The quantitative control mechanism of different amplitude tidal ranges on the dam body and branch channels of continental shelf deltas has garnered significant scientific interest. Methods In this study， a single factor control method was used to analyze the evolution of the key geologic bodies in the continental shelf delta under different tidal ranges using Delft3D hydrodynamic simulation software to establish four control groups： no， small， medium， and spring difference. Results The experimental results show that the down-cut depth and width of the branch channel decrease with the increase of the flow distance when there is no tidal effect. When tidal action is added， the number of distributary channels decreases with the increase of tidal range， but the down-cut degree and width of the distributary channels increase. The width-to-depth ratio of the branch channel ranges from 2-10 when there is no tidal action， and decreases to zero when there is a low tidal range. Under the influence of middle and spring tidal ranges， the width-to-depth ratio of the branch channel corresponds to 0-3 and 2-4， respectively. Conclusions The results show that tidal action is beneficial for increasing the broad-to-thickness ratio of sand bodies， and the delta morphology changes become more stable with the increase of tidal range. The number of branch channels in the delta under the influence of tides decreases significantly owing to the periodic influx and retreat of tides in the lateral direction. This promotes the formation of lateral channels and tidal channels. Under the influence of middle-spring difference， the lateral migration distance of the branch channel is shorter， the branch channel is more stable， and the dam body is more isolated， providing an important reference for reservoir configuration analysis of similar underground sediments.