During the construction of marine ranches, it is often difficult to predict the impact of the implementation of ecological regulation methods on marine ranch ecosystems, which poses severe challenges to the ecological security and health and high-quality development of marine ranches. In this study, a simulation and evaluation method on the ecosystem of marine ranches based on qualitative network model (QNM) was established, and a qualitative network model centered on the stocked target species was constructed by taking the coastal enhancement waters in the Zhangzi Island marine ranching as the modelled area, including community responses under three types of ecological regulation scenarios (stock enhancement, predator removal, and seaweed bed restoration) and their compounded scenarios in marine ranching, to analyze the potential relationship between ecological regulation strategies and changes in biological function groups. Results showed that the bottom-up trophic cascade effects of stocking the scallop Mizuhopecten yessoensis produced a positive impact on its predators, while the top-down effects had a negative impact on its prey, including other zoobenthos, phytoplankton, and organic detritus. The removal of predatory starfish showed a positive impact on the scallop M. yessoensis through the top-down effects, indicating the importance of removing the enemy organisms in the stocking areas. The simulated strategies of seaweed bed restoration showed a significantly positive effect on the entire community, reflecting the benefits of maintaining or increasing species diversity by seaweed bed in the ecosystem. By overcoming the data dependence of quantitative models, QNM can identify the potential trophic cascade effects and assess the response of biologically functional groups, thus effectively screen the ecological regulation strategies of marine ranches that can achieve the desired management objectives. The simulation and evaluation method of marine ranch ecological regulation based on QNM established in this study, can break through the limitations of using quantitative food web models in systems with limited data, providing the scientific support for the formulation of ecological regulation strategies for marine ranch construction.