Objective:To assess changes of nasal ventilation resulting from a one-piece Le Fort I-osteotomy in patients with maxillary dysplasia both objectively and subjectively. Methods:Thirty patients with maxillary dysplasia were classified into 2 groups. In group I (n=13), the surgical treatment plan included a one-piece Le Fort I-osteotomy with maxillary advancement. In group II, the surgical treatment plan included a one-piece Le Fort I-osteotomy with maxillary impaction, inferior or backward reposition. Rhinologic inspection, acoustic rhinometry(AR) were performed preoperatively, 3 and 6 months postoperatively. The nasal obstruction symptom evaluation (NOSE) scales were also completed by all patients preoperatively and 6 months postoperatively. The follow-up results were compared with baseline using SPSS software. Results:Acoustic rhinometry assessment showed that postoperative nasal airway resistance (NAR), nasal volume (NV) and minimal cross- sectional area (MCA) in both groups at 3 and 6 months got improved. But the differences were statistically insignificant. Improvement in nasal breathing was documented (by NOSE scores) at 6 months postoperatively in both groups, but with statistically significant difference in group Ⅱonly. Conclusions:Le Fort I-osteotomy with maxillary migration towards different directions will not aggravate nasal patency in patients with maxillary dysplasia. And the combination of objective (AR) and subjective (NOSE scale) assessment can offer a better evaluation of structure and function of nose.