Recurrence of pterygium is the most common failure of the pterygium operation. The use of conjunctival autograft after pterygium excision has shown a low recurrence rate. However, it has a board range of variations regarding the recurrence rates, which may be influenced by many factors. From the authors' clinical observation, it was found that the recurrence rate was higher in patients who received inadequate post-operative topical corticosteroid treatment.