This paper mainly uses the Rasa open source framework to design and implement the electricity charge query and fault repair dialogue system for a power customer service center. It introduces two modules of RasaNLU and RasaCore of Rasa system development framework, then introduces the system design and implementation methods in detail, including system organization architecture, intention and entity slot design, natural language understanding module design, dialogue management design, etc. It describes the development method of a joint model of intention recognition and slot filling as a Rasa framework component, and finally displays the system Web page.