1. Sometimes miscalled maxillary length when the premaxilla enters into the upper jaw.

2. Nasal process of premaxilla forms the whole posterior margin of the naris.

3. Using active preoperative orthopedics to reposit the protruding premaxilla of bilateral cleft palate is a reasonable and effective approach.

4. Results: Cephalometric analysis revealed that the premaxilla was moved forward and downward and the length of palatal plane increased.

5. It can be diagnosed by various details of the premaxilla, nasal, and dentary in the skull and the shape of the distal caudal vertebrae.