Requirements of modern inter-connected grids on restorative control are first clarified， followed by a summary on state-of-the-art of researches on the bottom-up， top-down and hybrid restoration strategies. From both technical and economic prospects， functions of a decision support system are pointed out. Based on risk analysis， an adaptive decision support system is proposed， influence of electricity market environment on blackstart service analyzed， and coordination between risk management and technical optimization discussed. In addition， it is emphasized that the technical performance of the startup service and the risk cost of blackout can be expressed by quantitative indices and added into the objective function for the optimization.