AIM:To discuss the method and effect of application of modified adjustable suture in trabeculectomy. METHODS:Trabeculectomy were done in 65 cases (70 eyes) of primary acute angle-closure glaucoma.Modified adjustable suture was used in scleral flap intraoperatively. Postoperative intraocular pressures, anterior chamber, filtering bleb, condition of adjustable suture were observed. RESULTS: All patients were followed up for 6-24 months (average 11 months). The time of taking out stitches ranged from 1 to 14 days (average 7.4 days). The intraocular pressure before taking out stitches was 13.30-28.46 (average 16.86) mmHg, after was 8.40-16.57 (average 10.50) mmHg, there was statistical significant difference (P<0.05). There were no complications after taking out stitches and filtering bleb leaking in 70 eyes. Postoperative shallow anterior chamber ofⅠdegree was in 3 eyes,Ⅱ degree in 2 eyes, the shallow anterior chamber rate was 7%. The intraocular pressure of final follow-up was 9.00-16.80 (average 11.45)mmHg in 70 eyes, flat filtering bleb in 55 eyes, tiny cystic filtering bleb in 15 eyes, functional filtering bleb 100%. CONCLUSION: Modified adjustable suture is safe in trabeculectomy and effective postoperatively, which can effectively control the aqueous filtration level and be benefit for the long-term intraocular pressure controlling and functional filtering bleb formation.