1, difference: Predator-prey model mainly studies the evolution process of food chain and food web, while infectious disease model studies the spread process of diseases in people. Predator-prey model is mainly used to predict the change of species number and spatial distribution, and provide decision support for ecological protection and management. Epidemic model is mainly used to predict the development trend of epidemic situation and the effect of control measures, and provide reference for public health and medical decision-making. Predator-prey model usually needs to consider the number of species, the length of food chain and the complexity of food network, while epidemic model needs to consider population structure, social behavior and medical resources.

2. Connection: Both models need to consider the interaction and influence between individuals in the ecosystem or population. Both models involve dynamic processes that change with time. By modeling and forecasting these processes, it can provide a basis for subsequent management and control. Both models can be modeled and analyzed by mathematical formula, computer simulation and experimental verification, which is highly scientific and repeatable.