Double eyelid operation is one of the most common cosmetic surgery in orientals. Among this, the non-incision technique has been usually performed in the patient with thin upper eyelid, lesser amounts of orbital fat, less redundant skin of upper eyelid, and so on. A non-incision technique make a more smooth and natural double eyelid. The merit comes from short operating time, short recovery time, less morbidity and inconspicuous scarring, Therefore, when we decide double eyelid operation on a patient who has a congenital unilateral double eyelid, we correct the aesthetic deformity in appearance caused by an unnatural asymetric upper lid which is not double eyelid using a non-incision technique. This study includes 255 patients to whom underwent double eyelid operation of unilateral double eyelid by non-incision techniques from 1990 to 1995, ranged in age 19 to 55years and follow-up period ranged from 2 months to 2 years. Two methods of non-incision technique were used in this study. One is single stitch method and the other is continuous buried suture method. The former was used in 176 patients(70.2% ) who are young with thin upper lid and the latter was used in 79 patients( 29.8% ) with redundant or puffy upper lid. Most of the patients were satisfied with smooth and symmetric appearance. We concluded that non-incision technique can be a good surgery method of correcting unilateral double eyelid. And we had good results using the continuous buried suture method in the case of puffy upper eyelid.