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目的：:探讨下斜肌后固定术（IOBT）在伴有轻中度下斜肌功能亢进的V型斜视中的治疗效果。方法：:前瞻性研究。选择2018年1月至2020年4月在徐州市第一人民医院行IOBT或者部分切除术的外斜V征患者40例，按照随机数字表法将患者随机分为IOBT组和下斜肌部分切除术（IOMYE）组，各20例。IOBT组行双眼IOBT+水平斜视矫正术，IOMYE组行双眼IOMYE+水平斜视矫正术。比较2组手术前后水平斜视度（HD）、V值、黄斑视乳头夹角（FDA）及下斜肌功能（IOA）等变化情况。随访时间为6个月。数据采用配对样本n t检验、独立样本n t检验进行分析。n 结果：:IOBT组17例（85%）治愈，IOMYE组14例（70%）治愈。IOBT组手术前后FDA变化差异无统计学意义（n t=1.313，n P=0.205）。2组间手术前后FDA、IOA、V值变化值的差异均有统计学意义（n t=-11.788，n P<0.001；n t=-3.701，n P=0.001；n t=-8.519，n P<0.001）。IOBT组术后无一例过矫为A征。IOMYE组6例V征过矫为A征，IOA轻度不足8例。n 结论：:IOBT术可安全、有效地治疗伴轻中度下斜肌亢进的外斜V征，是传统下斜肌减弱术的补充。“,”Objective::To investigate the effect of the application of the inferior oblique muscle belly transposition (IOBT) in V-pattern strabismus with mild-to-moderate inferior oblique overaction (IOOA).Methods::This was a prospective study. From January 2018 to April 2020, 40 patients (80 eyes) with V-pattern exotropia with minimal-to-moderate IOOA who underwent IOBT or inferior oblique myectomy (IOMYE) in Xuzhou No.1 People's Hospital were randomly divided into two groups: An IOBT group (n n=20) and an IOMYE group (n n=20). In addition to horizontal strabismus correction, the patients underwent IOBT in the IOBT group and inferior oblique myectomy (IOMYE) in the IOMYE group. There was a 6-month follow-up period. Horizontal deviation (HD), V pattern, foveal disc angle (FDA) and inferior oblique action (IOA) were analyzed before and after the operation. Data were analyzed using paired n t test and independent n t test.n Results::Seventeen (85%) patients were cured in the IOBT group and 14(70%) in the IOMYE group. There was no significant difference (n t=1.313, n P=0.205) in FDA before and after surgery in the IOBT group. The differences in changes in FDA, IOA and V pattern between the two groups were statistically significant (n t=-11.788, n P<0.001;n t=-3.701, n P=0.001; n t=-8.519, n P<0.001). Postoperatively, the IOBT group achieved satisfactory results, without overcorrection to an A pattern. In the IOMYE group, 6 patients were overcorrected to A pattern and 8 patients had mild underaction of the inferior oblique.n Conclusions::IOBT can successfully treat the V pattern in patients with mild-to-moderate IOOA. It is a supplement to traditional inferior oblique muscle weakening.