·AIM:To observe the effect of the asymmetrical surgery for concomitant strabismus·METHODS:Totally 138 patients with concomitant strabismus were analysed,incluing 88 cases concomitant exotropia and 50 cases concomitant esotropia,20 cases combined with vertical slant degree <7△,and 4 cases with mild eyeball recessiveness trembles.The average slant degree of exotropia was 30△-65△,and that of esotropia was 30△-70△.After the refraction and amblyopia treatment,the visual acuity of all patients was improved to >0.8,or the balance vision of binocular improved to 0.6,visual function was inspected with synoptophore and esotropia patients were corrected by wearing glasses for >half year.Strabismus patients with the difference of 33cm and 5m slant visual degree ≤15△ and slant visual degree within 30△-70△by triple prism underwent the asymmetrical surgery combined with the simple eye horizontal muscle withdrawal and reduction.The function training by synoptophore were performed for 10 days for patients aged from 6-14 years old 1 week after operation.·RESULTS:One month after operation:126 cases were corrected;8 cases were undercorrected;2 cases were overcorrected;2 cases were diplopia,vertical slant degree was not changed.Three months after operation:128 cases were corrected;8 cases were undercorrected;1 case was overcorrected;1 case was diplopia.Synoptophore inspection:Ⅰ,Ⅱ and Ⅲ levels visual functions were recovered after the function training,includingⅠlevel 35 cases,Ⅱlevel 58 cases and Ⅲ level 45 cases.·CONCLUSION:The asymmetrical surgery has a satisfied effect for concomitant strabismus.Function training after operation is helpful to restore visual function.·