As a useful expansion of the dispatching automation system， an assistant decision-making software for intelligent dispatch is developed to provide on-line assistant decision-making to dispatching operators from three aspects， i.e. intelligent alarm， fault diagnosis and fault restoration. The intelligent alarm module is used to classify alarming information and solve the signal disturbance problem with compression technology. By introducing the fault reliability index， the fault diagnosis module is enabled to establish a unified information model and a hierarchical diagnosis model， thus improving the practicality of fault diagnosis by adopting multi-mode diagnosis and reasoning technique. The fault restoration module is employed to propose rapid on-line technology for power supply restoration based on the radio principle. Meanwhile in light of the continuous process before and after the power fault， the software has the modules closely integrated into an organic whole that yields good operation effects.