The invention discloses a region-based security evaluation method for the distribution system, which belongs to the eld of electric power distribution system operation. The method contains the following steps: (1) acquiring distribution system security region and security boundaries according to substation transformer capacity of the distribution system and link relationships among the substation transformers (101); (2) acquiring the distance between operating point and the security boundaries (IO2); (3) judging whether the operating point is within the distribution system security region according to the distance between the operating point and security boundaries (103); if yes, performing step (4), otherwise, performing step (5); (4) acquiring the load shortage or excess L,- of a link unit (I04); (5) adjusting the load of the substation transformers until the operating point comes back to the distribution system security region, then performing step (4) (IO5). The method provides more information than traditional N-I simulation in distribution system security assessment; and reduces calculation, increases the operating speed and satisfies the requirement of real-time and on-line operation.
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