To address the lack of effective methods for evaluating the operation status of pump stations, as well as the high uncertainty and result distortion associated with traditional weighting and evaluation approaches, an evaluation method for pump station operation status based on improved combined weighting method and cloud model is proposed. An evaluation indicator system is constructed, consisting of three criteria: safety status monitoring, technical performance, and operational economy. The subjective weights are determined using the fuzzy AHP-DEMATEL method, while the objective weights are obtained through the CRITIC method based on historical operation data of the pump station. The combined weights are then derived by integrating the subjective and objective weights, and the operation status of the pump station is finally evaluated through the cloud model. Application examples verify that the proposed method can effectively handle uncertainty and fuzziness in the evaluation process. It can be applied to digital twin pump station systems, enabling integrated management of monitoring, evaluation, and early warning.