Abstract: In traditional modeling of basic units in integrated energy system (IES), the frequency characteristics of these units are often overlooked, leading to inaccuracies in reflecting system behaviors. To address this issue, firstly, the SLM(synthesis load model) is employed to characterize the properties of basic units in IES, thereby a basic unit model is established considering the frequency characteristics by integrating actual disturbance measurement data from the power grid, the frequency factors in the proposed model are determined to be L_DP \in 1.18, 1.63 and L_DQ \in −1.55, −1.13, which fall within the range of parameters for static frequency characteristic identification. Furthermore, simulation analyses are conducted on both the traditional basic unit model of IES and the model incorporating frequency characteristics. The fitting of simulation curves and the verification of parameter identification errors confirm the correctness and applicability of the proposed model. Finally, the economic feasibility of the basic unit model of the IES considering frequency characteristics is studied.