A novel substation-centralized uniformly-distributed distribution network one-line diagram is put forward to overcome many shortcomings of regular distribution network diagrams in situation awareness visualization.An improved F&R force-direction algorithm is developed to automatically generate such a diagram，which introduces traction force to shorten the long lines，the pull force to avoid the load being too close to the nearby lines，and the pull force to avoid the closeness between the nearby feeders and the section lines.Based on a qualitative analysis of situation visualization performance of the geographical connection diagram and uniformly-distributed connection diagram，an evaluation method for performance of situation awareness is put forward and the numerical calculation has been applied for those base diagram schemes，the numerical results showing that the situation visualization performance based on the uniformly-distributed connection diagram is evidently much better than what is based on the geographical connection diagram.