AIM:To observe the therapeutic effect of vertical displacement of horizontal recti for horizontal strabismus accompanied by micro-degree vertical strabismus． METHODS: Seven patients (9 eyes) who suffered from horizontal strabismus accompanied by micro-degree vertical strabismus were studied retrospectively．All patients were treated with lateral or medial rectus resection or recession and vertical displacement of these muscles．Follow-up lasted for 3-18(mean 6) months to observe its effect. RESULTS:All cases had a good correction with surgery.Of 5 patients (7 eyes), the vertical strabismus was 0^△. After the operation 1 patient (1 eye) had the by R/L8^△ turned into R/L2^△，1 patient had the by R/L6^△ into L/R2^△.During the follow-up period all patients did not present iatrogenic A-V phenomenon, diplopia, or compensatory head posture. CONCLUSION:Vertical displacement of horizontal recti is successful for horizontal strabismus accompanied by micro-degree vertical strabismus .