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Objective To evaluate the effects and clinical application of molar intrusion with a new mandibular mo⁃ lar intrusion appliance. Methods 7 patients who needed mandibular molars intrusion to correct open⁃bite were select⁃ ed. To evaluate effects of molar intrusion, clinical examination, dental model analysis and aphalometric analysis by Win⁃ ceph 7.0 software were used before and after intrusion treatment, SPSS 17.0 software was used for data analysis. Re⁃ sults All the mandibular molars were intruded successfully in an average time of 4.0 months. Cephalometric analysis before and after treatment showed that the average amount of mandibular first molars intrusion were (1.92 ± 0.44) mm ． The vertical distance to the reference plane (MP plane) per and post treatment was statistically significant (P < 0.05). The average amount of maxillary first molar intrusion was (0.36 ± 0.25) mm, with no significant difference in vertical distances to reference plane (PP plane) (P > 0.05). No signs of root resorption was obsersed in radiograph of the intrud⁃ ed mandibular molars. Conclusion The new mandibular molar intrusion appliance has a remarkable clinical effect in correcting anterior open bite without obvious periodontal tissue damage and root resorption. teeth intrusion with the new appliance has a significant effect without apparent destruction of the periodontal tissue and root resorption.