Based on the load transfer method, considering the pile-pile interaction and introducing Pyke criterion to simulate the loading and unloading behavior on the pile-soil interface, as well as to determine the model parameters of pile-soil interaction, settlement characteristic analysis method for the double-pile foundation of energy pile was established and extended to the energy pile group. The reliability of the proposed method was verified by comparing with the experimental data in the literature. Combined with an example, this method was used to analyze the settlement characteristics of energy pile group under the action of pure mechanical loading, pure temperature effect and thermal coupling. The results show that the displacement ratio of pile group decreases with increase of pile top load under mechanical loading. Under the action of temperature effect, the displacement direction of pile group top is consistent. Under the action of thermal coupling, the displacement of pile top of pile group is relevant with the specific load level of pile top and pile body temperature increment. When the load of pile top is small and the temperature rises, it is very probable that the top of single pile will be lifted while the top of pile group will sink.