The minimum break point set（MBPS） is the starting point for complex network setting coordination. Putting these break points in the MBPS into the exit lines of the less important nodes will greatly reduce the impact of breakpoint vulnerability on the grid. A method is proposed for selecting the MBPS from multi-MBPS with the same cardinal number based on the evaluation of node importance. It makes use of the complex network theory to estimate the importance of nodes which the break points of the MBPS calculation result belong to， then takes the sum of node importance of each MBPS as the measure indicator， and finally chooses the MBPS of the least importance as the starting point of setting coordination. The method effectively avoids the purposelessness of computer random selection and the complexity of setting engineer's selection. The feasibility of the method is proved with an example of simulation.