Objective:the clinic study related to Modified Vacuum Film Activator and Traditional Activa-tor about fabrication ,structure ,wear and clinical effection ;the study aimed to research the two appliance clinic ap-plication characteristics ,to provide the basis for clinical application .Methods :the experimental and the control group with 16 cases respectively received Modified Vacuum Film Activator and traditional activator .lateral cephalo-grams were Taken before and after the treatment .We used the Cephalometric analysis method from Xi'an Jiaotong u-niversity Stomatological Hospital Department of Orthodontics to analysis of the X-ray data measured before and after treatment ,and Paired t test statistical analysis which used SPSS 20 .0 .Results :Statistical data showed that the ex-perimental group compared with control group which a total of 5 measurments reached statistical significance ,they were very statistical significance is U 6-PP ;statistical significance were Co-Pg、U1-SN、U1-NA and ∠N'-Pg'-FH ,it had effective effort in treatment .Conclusion :Compared with the traditional group ,it using machines instead of manpower ,non-toxic ,economical ,appliance contact comfort ,compliance is better ,which can shorten the time of treatment ,treatment effect is more significant and can be used widely .%目的：探讨将真空成型改良式Activator与传统肌激动器从制作、矫治器结构、配戴和临床效果进行对比研究，以明确两种矫治器临床应用特点，为临床应用提供依据。方法：将试验组和对照组各16例分别配戴真空成型改良式Activator和传统肌激动器，拍治疗前后头颅定位侧位片。用X线头影测量分析方法分析治疗前后X线测量数据，并分析对比。结果：试验组与对照组比较，有统计学意义共5项，其中非常显著统计学意义是U6-PP ，有显著统计学意义是Co-Pg、U1-SN、U1-NA距和∠N＇-Pg＇-FH ，临床疗效显著。结论：试验组以机器代替人力，无毒操作，省时经济，矫治器隐形舒适，依从性良好，可缩短疗程，矫治效果更显著，可推广应用。
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