AIM:To investigate the efficacy and safety in patients with diplopia caused by paralytic strabismus treated with pressing triple prism.METHODS:Fourteen patients with paralytic strabismus were included in this study.All patients were given eye examination,optometry and weared frame spectacles;the patients complicated with blephroptosis were weared stent frame glasses.Pressed the corresponding degree of membranous triple prism to correct diplopia after mea-suring the degree of strabismus repeatedly.Then syno-ptophore was used to test the level Ⅰ function in patients.RESULTS:Among 14 cases,9 suffered from diplopia were completely disappeared,5 were obviously improved;and after the treatment,the compensatory head posture of 6 patients were gone,8 had level Ⅰ function by syno-ptophore test.CONCLUSION:Pressing triple prism is effective to relieve diplopia and compensatory head posture of the patient not suitable for the surgery,and it can improve the quality of life and not affect the treatment of primary disease.