The present invention provides a tool path forming method in a milling processing system, the method including: (A) a shape offset step (S10); (B) a virtual wall forming step (S20); (C) an interference region forming and shape revising step (S30 and S40); (D) a closed shape forming step (S50); (E) a cutting surface forming step (S60); (F) tool path forming steps (S70 and S80); (G) an unprocessed region detecting step (S90); and (H) an uncut region tool path forming step (S110).
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